51247944 has 64 divisors (see below), whose sum is σ = 155304000. Its totient is φ = 15528960.

The previous prime is 51247943. The next prime is 51247961. The reversal of 51247944 is 44974215.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51247899 and 51247908.

It is not an unprimeable number, because it can be changed into a prime (51247943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8409 + ... + 13160.

It is an arithmetic number, because the mean of its divisors is an integer number (2426625).

Almost surely, 2^51247944 is an apocalyptic number.

51247944 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51247944 is an abundant number, since it is smaller than the sum of its proper divisors (104056056).

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

51247944 is a wasteful number, since it uses less digits than its factorization.

51247944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21595 (or 21585 counting only the distinct ones).

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

The square root of 51247944 is about 7158.7669329292. The cubic root of 51247944 is about 371.4429748711.

The spelling of 51247944 in words is "fifty-one million, two hundred forty-seven thousand, nine hundred forty-four".