139691940 has 48 divisors (see below), whose sum is σ = 397776960. Its totient is φ = 36618880.

The previous prime is 139691899. The next prime is 139691953. The reversal of 139691940 is 49196931.

It is a junction number, because it is equal to n+sod(n) for n = 139691892 and 139691901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16191 + ... + 23270.

It is an arithmetic number, because the mean of its divisors is an integer number (8287020).

Almost surely, 2^139691940 is an apocalyptic number.

139691940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139691940 is an abundant number, since it is smaller than the sum of its proper divisors (258085020).

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

139691940 is a wasteful number, since it uses less digits than its factorization.

139691940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39532 (or 39530 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 139691940 is about 11819.1344860781. The cubic root of 139691940 is about 518.8682734142.

The spelling of 139691940 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, nine hundred forty".