51403956 has 12 divisors (see below), whose sum is σ = 119942592. Its totient is φ = 17134648.

The previous prime is 51403951. The next prime is 51403973. The reversal of 51403956 is 65930415.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51403951) 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 3 ways as a sum of consecutive naturals, for example, 2141820 + ... + 2141843.

It is an arithmetic number, because the mean of its divisors is an integer number (9995216).

Almost surely, 2^51403956 is an apocalyptic number.

It is an amenable number.

51403956 is an abundant number, since it is smaller than the sum of its proper divisors (68538636).

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

51403956 is a wasteful number, since it uses less digits than its factorization.

51403956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283670 (or 4283668 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 51403956 is about 7169.6552218360. The cubic root of 51403956 is about 371.8195158706.

The spelling of 51403956 in words is "fifty-one million, four hundred three thousand, nine hundred fifty-six".