51699838 has 4 divisors (see below), whose sum is σ = 77549760. Its totient is φ = 25849918.

The previous prime is 51699821. The next prime is 51699887. The reversal of 51699838 is 83899615.

51699838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51699791 and 51699800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12924958 + ... + 12924961.

It is an arithmetic number, because the mean of its divisors is an integer number (19387440).

Almost surely, 2^51699838 is an apocalyptic number.

51699838 is a deficient number, since it is larger than the sum of its proper divisors (25849922).

51699838 is a wasteful number, since it uses less digits than its factorization.

51699838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25849921.

The product of its digits is 466560, while the sum is 49.

The square root of 51699838 is about 7190.2599396684. The cubic root of 51699838 is about 372.5315511614.

The spelling of 51699838 in words is "fifty-one million, six hundred ninety-nine thousand, eight hundred thirty-eight".