51212940 has 48 divisors (see below), whose sum is σ = 143791200. Its totient is φ = 13619200.

The previous prime is 51212933. The next prime is 51212947. The reversal of 51212940 is 4921215.

It is an interprime number because it is at equal distance from previous prime (51212933) and next prime (51212947).

It is a self number, because there is not a number n which added to its sum of digits gives 51212940.

It is not an unprimeable number, because it can be changed into a prime (51212947) 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, 25990 + ... + 27890.

It is an arithmetic number, because the mean of its divisors is an integer number (2995650).

Almost surely, 2^51212940 is an apocalyptic number.

It is an amenable number.

51212940 is an abundant number, since it is smaller than the sum of its proper divisors (92578260).

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

51212940 is a wasteful number, since it uses less digits than its factorization.

51212940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362 (or 2360 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 51212940 is about 7156.3216808637. The cubic root of 51212940 is about 371.3583864288.

The spelling of 51212940 in words is "fifty-one million, two hundred twelve thousand, nine hundred forty".