51843904 has 56 divisors (see below), whose sum is σ = 121399808. Its totient is φ = 21496320.

The previous prime is 51843901. The next prime is 51843929. The reversal of 51843904 is 40934815.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×51843904² = 5375580763922432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51843904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51843901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12022 + ... + 15754.

Almost surely, 2^51843904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51843904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60699904).

51843904 is an abundant number, since it is smaller than the sum of its proper divisors (69555904).

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

51843904 is a wasteful number, since it uses less digits than its factorization.

51843904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783 (or 3773 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 51843904 is about 7200.2711060071. The cubic root of 51843904 is about 372.8772605379.

The spelling of 51843904 in words is "fifty-one million, eight hundred forty-three thousand, nine hundred four".