51243876 has 18 divisors (see below), whose sum is σ = 129533222. Its totient is φ = 17081280.

The previous prime is 51243847. The next prime is 51243877. The reversal of 51243876 is 67834215.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 2802276 = 6960^2 + 1674^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1423441 = 51243876 / (5 + 1 + 2 + 4 + 3 + 8 + 7 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 51243876.

It is not an unprimeable number, because it can be changed into a prime (51243877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 711685 + ... + 711756.

Almost surely, 2^51243876 is an apocalyptic number.

It is an amenable number.

51243876 is an abundant number, since it is smaller than the sum of its proper divisors (78289346).

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

51243876 is a wasteful number, since it uses less digits than its factorization.

51243876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423451 (or 1423446 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 51243876 is about 7158.4828001470. The cubic root of 51243876 is about 371.4331463793.

The spelling of 51243876 in words is "fifty-one million, two hundred forty-three thousand, eight hundred seventy-six".