51918740 has 12 divisors (see below), whose sum is σ = 109029396. Its totient is φ = 20767488.

The previous prime is 51918739. The next prime is 51918749. The reversal of 51918740 is 4781915.

It can be written as a sum of positive squares in 2 ways, for example, as 39287824 + 12630916 = 6268^2 + 3554^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51918740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51918749) 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, 1297949 + ... + 1297988.

It is an arithmetic number, because the mean of its divisors is an integer number (9085783).

Almost surely, 2^51918740 is an apocalyptic number.

It is an amenable number.

51918740 is an abundant number, since it is smaller than the sum of its proper divisors (57110656).

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

51918740 is a wasteful number, since it uses less digits than its factorization.

51918740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595946 (or 2595944 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 51918740 is about 7205.4659807677. The cubic root of 51918740 is about 373.0565887688.

It can be divided in two parts, 5191 and 8740, that added together give a palindrome (13931).

The spelling of 51918740 in words is "fifty-one million, nine hundred eighteen thousand, seven hundred forty".