52139808 has 192 divisors, whose sum is σ = 179262720. Its totient is φ = 14432256.

The previous prime is 52139807. The next prime is 52139809. The reversal of 52139808 is 80893125.

It is an interprime number because it is at equal distance from previous prime (52139807) and next prime (52139809).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (52139803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223660 + ... + 223892.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^52139808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52139808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89631360).

52139808 is an abundant number, since it is smaller than the sum of its proper divisors (127122912).

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

52139808 is a wasteful number, since it uses less digits than its factorization.

52139808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 52139808 is about 7220.7899844823. The cubic root of 52139808 is about 373.5853259035.

The spelling of 52139808 in words is "fifty-two million, one hundred thirty-nine thousand, eight hundred eight".