51236140 has 12 divisors (see below), whose sum is σ = 107595936. Its totient is φ = 20494448.

The previous prime is 51236137. The next prime is 51236153. The reversal of 51236140 is 4163215.

51236140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280884 + ... + 1280923.

It is an arithmetic number, because the mean of its divisors is an integer number (8966328).

Almost surely, 2^51236140 is an apocalyptic number.

It is an amenable number.

51236140 is an abundant number, since it is smaller than the sum of its proper divisors (56359796).

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

51236140 is a wasteful number, since it uses less digits than its factorization.

51236140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561816 (or 2561814 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51236140 is about 7157.9424417915. The cubic root of 51236140 is about 371.4144543803.

Adding to 51236140 its reverse (4163215), we get a palindrome (55399355).

The spelling of 51236140 in words is "fifty-one million, two hundred thirty-six thousand, one hundred forty".