51836399 has 4 divisors (see below), whose sum is σ = 51861264. Its totient is φ = 51811536.

The previous prime is 51836387. The next prime is 51836401. The reversal of 51836399 is 99363815.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51836399 - 2⁸ = 51836143 is a prime.

It is a super-2 number, since 2×51836399² = 5374024522574402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51836339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8987 + ... + 13580.

It is an arithmetic number, because the mean of its divisors is an integer number (12965316).

Almost surely, 2^51836399 is an apocalyptic number.

51836399 is a deficient number, since it is larger than the sum of its proper divisors (24865).

51836399 is a wasteful number, since it uses less digits than its factorization.

51836399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24864.

The product of its digits is 174960, while the sum is 44.

The square root of 51836399 is about 7199.7499262127. The cubic root of 51836399 is about 372.8592669156.

The spelling of 51836399 in words is "fifty-one million, eight hundred thirty-six thousand, three hundred ninety-nine".