51402393 has 24 divisors (see below), whose sum is σ = 86299200. Its totient is φ = 28872864.

The previous prime is 51402389. The next prime is 51402409. The reversal of 51402393 is 39320415.

It is not a de Polignac number, because 51402393 - 2² = 51402389 is a prime.

It is a super-2 number, since 2×51402393² = 5284412012252898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402193) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3198 + ... + 10631.

It is an arithmetic number, because the mean of its divisors is an integer number (3595800).

Almost surely, 2^51402393 is an apocalyptic number.

It is an amenable number.

51402393 is a deficient number, since it is larger than the sum of its proper divisors (34896807).

51402393 is a wasteful number, since it uses less digits than its factorization.

51402393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13901 (or 13898 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 51402393 is about 7169.5462199500. The cubic root of 51402393 is about 371.8157472904.

The spelling of 51402393 in words is "fifty-one million, four hundred two thousand, three hundred ninety-three".