51440406 has 8 divisors (see below), whose sum is σ = 102880824. Its totient is φ = 17146800.

The previous prime is 51440393. The next prime is 51440437. The reversal of 51440406 is 60404415.

It is a sphenic number, since it is the product of 3 distinct primes.

51440406 is an admirable number.

It is a super-2 number, since 2×51440406² = 5292230738889672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4286695 + ... + 4286706.

It is an arithmetic number, because the mean of its divisors is an integer number (12860103).

Almost surely, 2^51440406 is an apocalyptic number.

51440406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51440406 is a wasteful number, since it uses less digits than its factorization.

51440406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8573406.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 51440406 is about 7172.1967346135. The cubic root of 51440406 is about 371.9073795312.

The spelling of 51440406 in words is "fifty-one million, four hundred forty thousand, four hundred six".