642249 has 14 divisors (see below), whose sum is σ = 964026. Its totient is φ = 427680.

The previous prime is 642247. The next prime is 642253. The reversal of 642249 is 942246.

642249 is nontrivially palindromic in base 16.

642249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 455625 + 186624 = 675^2 + 432^2 .

It is not a de Polignac number, because 642249 - 2¹ = 642247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 6³ + 4⁶ + 2¹³ + 2¹⁵ + 4⁸ + 9⁶ .

It is not an unprimeable number, because it can be changed into a prime (642241) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 289 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (68859).

2⁶⁴²²⁴⁹ is an apocalyptic number.

It is an amenable number.

642249 is a deficient number, since it is larger than the sum of its proper divisors (321777).

642249 is an frugal number, since it uses more digits than its factorization.

642249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 884 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 642249 is about 801.4043923014. The cubic root of 642249 is about 86.2782138322.

The spelling of 642249 in words is "six hundred forty-two thousand, two hundred forty-nine".