139540680 has 48 divisors (see below), whose sum is σ = 453508380. Its totient is φ = 37210752.

The previous prime is 139540657. The next prime is 139540729. The reversal of 139540680 is 86045931.

139540680 is a `hidden beast` number, since 1 + 39 + 540 + 6 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 129004164 + 10536516 = 11358^2 + 3246^2 .

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 11 ways as a sum of consecutive naturals, for example, 193447 + ... + 194166.

Almost surely, 2^139540680 is an apocalyptic number.

139540680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139540680 is an abundant number, since it is smaller than the sum of its proper divisors (313967700).

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

139540680 is a wasteful number, since it uses less digits than its factorization.

139540680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387630 (or 387623 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 139540680 is about 11812.7338072099. The cubic root of 139540680 is about 518.6809269816.

The spelling of 139540680 in words is "one hundred thirty-nine million, five hundred forty thousand, six hundred eighty".