Search a number

24649 has 3 divisors (see below), whose sum is σ = 24807. Its totient is φ = 24492.

The previous prime is 24631. The next prime is 24659. The reversal of 24649 is 94642.

24649 = T156 + T157.

The square root of 24649 is 157.

It is a perfect power (a square), and thus also a powerful number.

24649 is nontrivially palindromic in base 12.

24649 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 7225 + 17424 = 85^2 + 132^2 .

It is not a de Polignac number, because 24649 - 29 = 24137 is a prime.

It is a Duffinian number.

24649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (24659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79 + ... + 235.

It is an arithmetic number, because the mean of its divisors is an integer number (8269).

224649 is an apocalyptic number.

24649 is the 157-th square number.

24649 is the 79-th centered octagonal number.

It is an amenable number.

24649 is a deficient number, since it is larger than the sum of its proper divisors (158).

24649 is an frugal number, since it uses more digits than its factorization.

24649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 157 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The cubic root of 24649 is about 29.1026878793.

Multiplying 24649 by its sum of digits (25), we get a square (616225 = 7852).

It can be divided in two parts, 24 and 649, that multiplied together give a triangular number (15576 = T176).

The spelling of 24649 in words is "twenty-four thousand, six hundred forty-nine".

Divisors: 1 157 24649