39890231808 has 320 divisors, whose sum is σ = 129292796160. Its totient is φ = 10668736512.

The previous prime is 39890231783. The next prime is 39890231809. The reversal of 39890231808 is 80813209893.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (39890231809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41857060 + ... + 41858012.

It is an arithmetic number, because the mean of its divisors is an integer number (404039988).

Almost surely, 2^39890231808 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 39890231808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64646398080).

39890231808 is an abundant number, since it is smaller than the sum of its proper divisors (89402564352).

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

39890231808 is a wasteful number, since it uses less digits than its factorization.

39890231808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 39890231808 in words is "thirty-nine billion, eight hundred ninety million, two hundred thirty-one thousand, eight hundred eight".