51402140 has 24 divisors (see below), whose sum is σ = 109314240. Its totient is φ = 20299968.

The previous prime is 51402041. The next prime is 51402187. The reversal of 51402140 is 4120415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14687 + ... + 17846.

It is an arithmetic number, because the mean of its divisors is an integer number (4554760).

Almost surely, 2^51402140 is an apocalyptic number.

It is an amenable number.

51402140 is an abundant number, since it is smaller than the sum of its proper divisors (57912100).

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

51402140 is a wasteful number, since it uses less digits than its factorization.

51402140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32621 (or 32619 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 51402140 is about 7169.5285758549. The cubic root of 51402140 is about 371.8151372699.

Adding to 51402140 its reverse (4120415), we get a palindrome (55522555).

The spelling of 51402140 in words is "fifty-one million, four hundred two thousand, one hundred forty".