51623940 has 24 divisors (see below), whose sum is σ = 144547200. Its totient is φ = 13766368.

The previous prime is 51623939. The next prime is 51623941. The reversal of 51623940 is 4932615.

It is an interprime number because it is at equal distance from previous prime (51623939) and next prime (51623941).

It is a super-2 number, since 2×51623940² = 5330062362247200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51623898 and 51623907.

It is not an unprimeable number, because it can be changed into a prime (51623941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430140 + ... + 430259.

It is an arithmetic number, because the mean of its divisors is an integer number (6022800).

Almost surely, 2^51623940 is an apocalyptic number.

It is an amenable number.

51623940 is an abundant number, since it is smaller than the sum of its proper divisors (92923260).

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

51623940 is a wasteful number, since it uses less digits than its factorization.

51623940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860411 (or 860409 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 51623940 is about 7184.9801669872. The cubic root of 51623940 is about 372.3491634393.

The spelling of 51623940 in words is "fifty-one million, six hundred twenty-three thousand, nine hundred forty".