51939290 has 64 divisors (see below), whose sum is σ = 108864000. Its totient is φ = 17681664.

The previous prime is 51939287. The next prime is 51939299. The reversal of 51939290 is 9293915.

51939290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51939299) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 86411 + ... + 87009.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^51939290 is an apocalyptic number.

51939290 is an abundant number, since it is smaller than the sum of its proper divisors (56924710).

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

51939290 is a wasteful number, since it uses less digits than its factorization.

51939290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 51939290 is about 7206.8918404538. The cubic root of 51939290 is about 373.1058022234.

The spelling of 51939290 in words is "fifty-one million, nine hundred thirty-nine thousand, two hundred ninety".