51903939 has 16 divisors (see below), whose sum is σ = 74707200. Its totient is φ = 31955616.

The previous prime is 51903931. The next prime is 51903959. The reversal of 51903939 is 93930915.

It is not a de Polignac number, because 51903939 - 2³ = 51903931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51903897 and 51903906.

It is not an unprimeable number, because it can be changed into a prime (51903931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10969 + ... + 14970.

It is an arithmetic number, because the mean of its divisors is an integer number (4669200).

Almost surely, 2^51903939 is an apocalyptic number.

51903939 is a deficient number, since it is larger than the sum of its proper divisors (22803261).

51903939 is a wasteful number, since it uses less digits than its factorization.

51903939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25994.

The product of its (nonzero) digits is 32805, while the sum is 39.

The square root of 51903939 is about 7204.4388400485. The cubic root of 51903939 is about 373.0211350620.

The spelling of 51903939 in words is "fifty-one million, nine hundred three thousand, nine hundred thirty-nine".