53991918 has 48 divisors (see below), whose sum is σ = 121355520. Its totient is φ = 17336592.

The previous prime is 53991877. The next prime is 53991919. The reversal of 53991918 is 81919935.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53991919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60705 + ... + 61587.

It is an arithmetic number, because the mean of its divisors is an integer number (2528240).

Almost surely, 2^53991918 is an apocalyptic number.

53991918 is an abundant number, since it is smaller than the sum of its proper divisors (67363602).

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

53991918 is a wasteful number, since it uses less digits than its factorization.

53991918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013 (or 1010 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 53991918 is about 7347.9192973249. The cubic root of 53991918 is about 377.9574572093.

The spelling of 53991918 in words is "fifty-three million, nine hundred ninety-one thousand, nine hundred eighteen".