51401400 has 48 divisors (see below), whose sum is σ = 159346200. Its totient is φ = 13706880.

The previous prime is 51401393. The next prime is 51401401. The reversal of 51401400 is 410415.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51401400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51401401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42235 + ... + 43434.

Almost surely, 2^51401400 is an apocalyptic number.

51401400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51401400 is an abundant number, since it is smaller than the sum of its proper divisors (107944800).

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

51401400 is a wasteful number, since it uses less digits than its factorization.

51401400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85688 (or 85679 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51401400 is about 7169.4769683708. The cubic root of 51401400 is about 371.8133530088.

Adding to 51401400 its reverse (410415), we get a palindrome (51811815).

The spelling of 51401400 in words is "fifty-one million, four hundred one thousand, four hundred".