51814390 has 32 divisors (see below), whose sum is σ = 96694560. Its totient is φ = 19977984.

The previous prime is 51814381. The next prime is 51814391. The reversal of 51814390 is 9341815.

It is a super-2 number, since 2×51814390² = 5369462022144200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51814391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30442 + ... + 32098.

It is an arithmetic number, because the mean of its divisors is an integer number (3021705).

Almost surely, 2^51814390 is an apocalyptic number.

51814390 is a deficient number, since it is larger than the sum of its proper divisors (44880170).

51814390 is a wasteful number, since it uses less digits than its factorization.

51814390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51814390 is about 7198.2213080733. The cubic root of 51814390 is about 372.8064891927.

The spelling of 51814390 in words is "fifty-one million, eight hundred fourteen thousand, three hundred ninety".