53399557 has 4 divisors (see below), whose sum is σ = 56210080. Its totient is φ = 50589036.

The previous prime is 53399551. The next prime is 53399561. The reversal of 53399557 is 75599335.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53399557 is a prime.

It is the 7308-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53399551) by changing a digit.

It is a nontrivial repunit in base 7307.

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 3 ways as a sum of consecutive naturals, for example, 1405233 + ... + 1405270.

It is an arithmetic number, because the mean of its divisors is an integer number (14052520).

Almost surely, 2^53399557 is an apocalyptic number.

It is an amenable number.

53399557 is a deficient number, since it is larger than the sum of its proper divisors (2810523).

53399557 is a wasteful number, since it uses less digits than its factorization.

53399557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810522.

The product of its digits is 637875, while the sum is 46.

The square root of 53399557 is about 7307.5000513171. The cubic root of 53399557 is about 376.5701442535.

It can be divided in two parts, 53399 and 557, that added together give a triangular number (53956 = T₃₂₈).

The spelling of 53399557 in words is "fifty-three million, three hundred ninety-nine thousand, five hundred fifty-seven".