51387492 has 36 divisors (see below), whose sum is σ = 129842160. Its totient is φ = 15810912.

The previous prime is 51387397. The next prime is 51387509. The reversal of 51387492 is 29478315.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 51387492.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10642 + ... + 14697.

Almost surely, 2^51387492 is an apocalyptic number.

51387492 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51387492 is an abundant number, since it is smaller than the sum of its proper divisors (78454668).

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

51387492 is a wasteful number, since it uses less digits than its factorization.

51387492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25372 (or 25357 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 51387492 is about 7168.5069575191. The cubic root of 51387492 is about 371.7798153582.

The spelling of 51387492 in words is "fifty-one million, three hundred eighty-seven thousand, four hundred ninety-two".