51415400 has 24 divisors (see below), whose sum is σ = 119541270. Its totient is φ = 20566080.

The previous prime is 51415379. The next prime is 51415447. The reversal of 51415400 is 451415.

It can be written as a sum of positive squares in 3 ways, for example, as 43270084 + 8145316 = 6578^2 + 2854^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 128339 + ... + 128738.

Almost surely, 2^51415400 is an apocalyptic number.

51415400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51415400 is an abundant number, since it is smaller than the sum of its proper divisors (68125870).

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

51415400 is a wasteful number, since it uses less digits than its factorization.

51415400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257093 (or 257084 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51415400 is about 7170.4532632184. The cubic root of 51415400 is about 371.8471063983.

Adding to 51415400 its reverse (451415), we get a palindrome (51866815).

It can be divided in two parts, 51415 and 400, that added together give a palindrome (51815).

The spelling of 51415400 in words is "fifty-one million, four hundred fifteen thousand, four hundred".