51807438 has 40 divisors (see below), whose sum is σ = 117516168. Its totient is φ = 17056656.

The previous prime is 51807419. The next prime is 51807451. The reversal of 51807438 is 83470815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11520 + ... + 15372.

Almost surely, 2^51807438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51807438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58758084).

51807438 is an abundant number, since it is smaller than the sum of its proper divisors (65708730).

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

51807438 is a wasteful number, since it uses less digits than its factorization.

51807438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950 (or 3941 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 51807438 is about 7197.7383948015. The cubic root of 51807438 is about 372.7898151463.

The spelling of 51807438 in words is "fifty-one million, eight hundred seven thousand, four hundred thirty-eight".