139186920 has 64 divisors (see below), whose sum is σ = 420894720. Its totient is φ = 36820224.

The previous prime is 139186919. The next prime is 139186963. The reversal of 139186920 is 29681931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10674 + ... + 19806.

It is an arithmetic number, because the mean of its divisors is an integer number (6576480).

Almost surely, 2^139186920 is an apocalyptic number.

139186920 is a gapful number since it is divisible by the number (10) 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 139186920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210447360).

139186920 is an abundant number, since it is smaller than the sum of its proper divisors (281707800).

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

139186920 is a wasteful number, since it uses less digits than its factorization.

139186920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9274 (or 9270 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 139186920 is about 11797.7506330656. The cubic root of 139186920 is about 518.2422404709.

The spelling of 139186920 in words is "one hundred thirty-nine million, one hundred eighty-six thousand, nine hundred twenty".