51888239 has 6 divisors (see below), whose sum is σ = 56186856. Its totient is φ = 47896680.

The previous prime is 51888223. The next prime is 51888269. The reversal of 51888239 is 93288815.

It is not a de Polignac number, because 51888239 - 2⁴ = 51888223 is a prime.

It is a super-2 number, since 2×51888239² = 5384778693042242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51888239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51888209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 153347 + ... + 153684.

It is an arithmetic number, because the mean of its divisors is an integer number (9364476).

Almost surely, 2^51888239 is an apocalyptic number.

51888239 is a deficient number, since it is larger than the sum of its proper divisors (4298617).

51888239 is a wasteful number, since it uses less digits than its factorization.

51888239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307057 (or 307044 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 51888239 is about 7203.3491516100. The cubic root of 51888239 is about 372.9835205603.

The spelling of 51888239 in words is "fifty-one million, eight hundred eighty-eight thousand, two hundred thirty-nine".