44742721 has 3 divisors (see below), whose sum is σ = 44749411. Its totient is φ = 44736032.

The previous prime is 44742713. The next prime is 44742743. The reversal of 44742721 is 12724744.

The square root of 44742721 is 6689.

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

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., 37344321 + 7398400 = 6111^2 + 2720^2 .

It is not a de Polignac number, because 44742721 - 2³ = 44742713 is a prime.

It is a super-2 number, since 2×44742721² = 4003822164967682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44742781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3345 + ... + 10033.

Almost surely, 2^44742721 is an apocalyptic number.

44742721 is the 6689-th square number.

44742721 is the 3345-th centered octagonal number.

It is an amenable number.

44742721 is a deficient number, since it is larger than the sum of its proper divisors (6690).

44742721 is an frugal number, since it uses more digits than its factorization.

44742721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378 (or 6689 counting only the distinct ones).

The product of its digits is 12544, while the sum is 31.

The cubic root of 44742721 is about 355.0101722933.

Multiplying 44742721 by its product of digits (12544), we get a square (561252692224 = 749168²).

The spelling of 44742721 in words is "forty-four million, seven hundred forty-two thousand, seven hundred twenty-one".