139123140 has 96 divisors (see below), whose sum is σ = 422343936. Its totient is φ = 34014720.

The previous prime is 139123129. The next prime is 139123147. The reversal of 139123140 is 41321931.

It is a self number, because there is not a number n which added to its sum of digits gives 139123140.

It is not an unprimeable number, because it can be changed into a prime (139123147) 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, 134425 + ... + 135455.

It is an arithmetic number, because the mean of its divisors is an integer number (4399416).

Almost surely, 2^139123140 is an apocalyptic number.

139123140 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 139123140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211171968).

139123140 is an abundant number, since it is smaller than the sum of its proper divisors (283220796).

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

139123140 is a wasteful number, since it uses less digits than its factorization.

139123140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 139123140 is about 11795.0472656959. The cubic root of 139123140 is about 518.1630698609.

It can be divided in two parts, 1391 and 23140, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 139123140 in words is "one hundred thirty-nine million, one hundred twenty-three thousand, one hundred forty".