139366920 has 128 divisors (see below), whose sum is σ = 521303040. Its totient is φ = 28957440.

The previous prime is 139366889. The next prime is 139366933. The reversal of 139366920 is 29663931.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1699 + ... + 16781.

It is an arithmetic number, because the mean of its divisors is an integer number (4072680).

Almost surely, 2^139366920 is an apocalyptic number.

139366920 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 139366920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260651520).

139366920 is an abundant number, since it is smaller than the sum of its proper divisors (381936120).

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

139366920 is a wasteful number, since it uses less digits than its factorization.

139366920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15115 (or 15111 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 139366920 is about 11805.3767411294. The cubic root of 139366920 is about 518.4655455055.

The spelling of 139366920 in words is "one hundred thirty-nine million, three hundred sixty-six thousand, nine hundred twenty".