53440731 has 6 divisors (see below), whose sum is σ = 77192180. Its totient is φ = 35627148.

The previous prime is 53440729. The next prime is 53440747. The reversal of 53440731 is 13704435.

It is not a de Polignac number, because 53440731 - 2¹ = 53440729 is a prime.

It is a super-2 number, since 2×53440731² = 5711823459628722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53440695 and 53440704.

It is not an unprimeable number, because it can be changed into a prime (53440771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2968921 + ... + 2968938.

Almost surely, 2^53440731 is an apocalyptic number.

53440731 is a deficient number, since it is larger than the sum of its proper divisors (23751449).

53440731 is a wasteful number, since it uses less digits than its factorization.

53440731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5937865 (or 5937862 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 53440731 is about 7310.3167510033. The cubic root of 53440731 is about 376.6669048301. Note that the first 3 decimals are identical.

The spelling of 53440731 in words is "fifty-three million, four hundred forty thousand, seven hundred thirty-one".