51821924 has 24 divisors (see below), whose sum is σ = 113066688. Its totient is φ = 20190240.

The previous prime is 51821893. The next prime is 51821951. The reversal of 51821924 is 42912815.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83819 + ... + 84434.

It is an arithmetic number, because the mean of its divisors is an integer number (4711112).

Almost surely, 2^51821924 is an apocalyptic number.

It is an amenable number.

51821924 is an abundant number, since it is smaller than the sum of its proper divisors (61244764).

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

51821924 is a wasteful number, since it uses less digits than its factorization.

51821924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168275 (or 168273 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 51821924 is about 7198.7446127780. The cubic root of 51821924 is about 372.8245574550.

The spelling of 51821924 in words is "fifty-one million, eight hundred twenty-one thousand, nine hundred twenty-four".