51389900 has 18 divisors (see below), whose sum is σ = 111516300. Its totient is φ = 20555920.

The previous prime is 51389881. The next prime is 51389953. The reversal of 51389900 is 998315.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256850 + ... + 257049.

It is an arithmetic number, because the mean of its divisors is an integer number (6195350).

Almost surely, 2^51389900 is an apocalyptic number.

51389900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51389900 is an abundant number, since it is smaller than the sum of its proper divisors (60126400).

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

51389900 is a wasteful number, since it uses less digits than its factorization.

51389900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513913 (or 513906 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 51389900 is about 7168.6749124228. The cubic root of 51389900 is about 371.7856224251.

The spelling of 51389900 in words is "fifty-one million, three hundred eighty-nine thousand, nine hundred".