51237440 has 28 divisors (see below), whose sum is σ = 122009916. Its totient is φ = 20494848.

The previous prime is 51237427. The next prime is 51237443. The reversal of 51237440 is 4473215.

It can be written as a sum of positive squares in 2 ways, for example, as 15429184 + 35808256 = 3928^2 + 5984^2 .

It is not an unprimeable number, because it can be changed into a prime (51237443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79739 + ... + 80378.

It is an arithmetic number, because the mean of its divisors is an integer number (4357497).

Almost surely, 2^51237440 is an apocalyptic number.

It is an amenable number.

51237440 is an abundant number, since it is smaller than the sum of its proper divisors (70772476).

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

51237440 is a wasteful number, since it uses less digits than its factorization.

51237440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160134 (or 160124 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 51237440 is about 7158.0332494338. The cubic root of 51237440 is about 371.4175956182.

The spelling of 51237440 in words is "fifty-one million, two hundred thirty-seven thousand, four hundred forty".