139123908 has 144 divisors (see below), whose sum is σ = 452874240. Its totient is φ = 34948800.

The previous prime is 139123891. The next prime is 139123913. The reversal of 139123908 is 809321931.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85123 + ... + 86741.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^139123908 is an apocalyptic number.

139123908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139123908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226437120).

139123908 is an abundant number, since it is smaller than the sum of its proper divisors (313750332).

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

139123908 is a wasteful number, since it uses less digits than its factorization.

139123908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 139123908 is about 11795.0798216884. The cubic root of 139123908 is about 518.1640233291.

The spelling of 139123908 in words is "one hundred thirty-nine million, one hundred twenty-three thousand, nine hundred eight".