51402312 has 48 divisors (see below), whose sum is σ = 149926140. Its totient is φ = 15815808.

The previous prime is 51402311. The next prime is 51402317. The reversal of 51402312 is 21320415.

It can be written as a sum of positive squares in 2 ways, for example, as 47692836 + 3709476 = 6906^2 + 1926^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51402311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26523 + ... + 28394.

Almost surely, 2^51402312 is an apocalyptic number.

51402312 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51402312 is an abundant number, since it is smaller than the sum of its proper divisors (98523828).

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

51402312 is a wasteful number, since it uses less digits than its factorization.

51402312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54942 (or 54935 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51402312 is about 7169.5405710547. The cubic root of 51402312 is about 371.8155519876.

Adding to 51402312 its reverse (21320415), we get a palindrome (72722727).

The spelling of 51402312 in words is "fifty-one million, four hundred two thousand, three hundred twelve".