53959815 has 48 divisors (see below), whose sum is σ = 115123008. Its totient is φ = 22768128.

The previous prime is 53959811. The next prime is 53959823. The reversal of 53959815 is 51895935.

53959815 is a `hidden beast` number, since 53 + 9 + 598 + 1 + 5 = 666.

It is not a de Polignac number, because 53959815 - 2² = 53959811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53959811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2494 + ... + 10683.

It is an arithmetic number, because the mean of its divisors is an integer number (2398396).

Almost surely, 2^53959815 is an apocalyptic number.

53959815 is an abundant number, since it is smaller than the sum of its proper divisors (61163193).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53959815 is a wasteful number, since it uses less digits than its factorization.

53959815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13208 (or 13205 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 53959815 is about 7345.7344765517. The cubic root of 53959815 is about 377.8825325766.

The spelling of 53959815 in words is "fifty-three million, nine hundred fifty-nine thousand, eight hundred fifteen".