51997894 has 32 divisors (see below), whose sum is σ = 88724160. Its totient is φ = 22674432.

The previous prime is 51997873. The next prime is 51997901. The reversal of 51997894 is 49879915.

51997894 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, 52734 + ... + 53710.

It is an arithmetic number, because the mean of its divisors is an integer number (2772630).

Almost surely, 2^51997894 is an apocalyptic number.

51997894 is a deficient number, since it is larger than the sum of its proper divisors (36726266).

51997894 is a wasteful number, since it uses less digits than its factorization.

51997894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its digits is 816480, while the sum is 52.

The square root of 51997894 is about 7210.9565246228. The cubic root of 51997894 is about 373.2460767236.

The spelling of 51997894 in words is "fifty-one million, nine hundred ninety-seven thousand, eight hundred ninety-four".