51490390 has 32 divisors (see below), whose sum is σ = 106170624. Its totient is φ = 17612640.

The previous prime is 51490381. The next prime is 51490409. The reversal of 51490390 is 9309415.

51490390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56317 + ... + 57223.

It is an arithmetic number, because the mean of its divisors is an integer number (3317832).

Almost surely, 2^51490390 is an apocalyptic number.

51490390 is an abundant number, since it is smaller than the sum of its proper divisors (54680234).

51490390 is a wasteful number, since it uses less digits than its factorization.

51490390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 51490390 is about 7175.6804555387. The cubic root of 51490390 is about 372.0277997878.

The spelling of 51490390 in words is "fifty-one million, four hundred ninety thousand, three hundred ninety".