51538407 has 16 divisors (see below), whose sum is σ = 73029600. Its totient is φ = 32218112.

The previous prime is 51538397. The next prime is 51538411. The reversal of 51538407 is 70483515.

It is a cyclic number.

It is not a de Polignac number, because 51538407 - 2⁴ = 51538391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13219 + ... + 16667.

It is an arithmetic number, because the mean of its divisors is an integer number (4564350).

Almost surely, 2^51538407 is an apocalyptic number.

51538407 is a deficient number, since it is larger than the sum of its proper divisors (21491193).

51538407 is a wasteful number, since it uses less digits than its factorization.

51538407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 51538407 is about 7179.0254909702. The cubic root of 51538407 is about 372.1434078256.

The spelling of 51538407 in words is "fifty-one million, five hundred thirty-eight thousand, four hundred seven".