52640399 has 16 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 43007712.

The previous prime is 52640389. The next prime is 52640417. The reversal of 52640399 is 99304625.

It is a cyclic number.

It is not a de Polignac number, because 52640399 - 2²⁰ = 51591823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52640309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89384 + ... + 89970.

It is an arithmetic number, because the mean of its divisors is an integer number (3937248).

Almost surely, 2^52640399 is an apocalyptic number.

52640399 is a deficient number, since it is larger than the sum of its proper divisors (10355569).

52640399 is a wasteful number, since it uses less digits than its factorization.

52640399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 52640399 is about 7255.3703558123. The cubic root of 52640399 is about 374.7771096200. Note that the first 3 decimals are identical.

The spelling of 52640399 in words is "fifty-two million, six hundred forty thousand, three hundred ninety-nine".