51909372 has 36 divisors (see below), whose sum is σ = 134765176. Its totient is φ = 16835040.

The previous prime is 51909359. The next prime is 51909373. The reversal of 51909372 is 27390915.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51909373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18154 + ... + 20817.

Almost surely, 2^51909372 is an apocalyptic number.

It is an amenable number.

51909372 is an abundant number, since it is smaller than the sum of its proper divisors (82855804).

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

51909372 is a wasteful number, since it uses less digits than its factorization.

51909372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39018 (or 39013 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 51909372 is about 7204.8158893895. The cubic root of 51909372 is about 373.0341498297.

The spelling of 51909372 in words is "fifty-one million, nine hundred nine thousand, three hundred seventy-two".