136921872 has 40 divisors (see below), whose sum is σ = 357700320. Its totient is φ = 45126400.

The previous prime is 136921871. The next prime is 136921879. The reversal of 136921872 is 278129631.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 136921872.

It is not an unprimeable number, because it can be changed into a prime (136921871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11754 + ... + 20297.

It is an arithmetic number, because the mean of its divisors is an integer number (8942508).

Almost surely, 2^136921872 is an apocalyptic number.

136921872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

136921872 is an abundant number, since it is smaller than the sum of its proper divisors (220778448).

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

136921872 is a wasteful number, since it uses less digits than its factorization.

136921872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32151 (or 32145 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 136921872 is about 11701.3619720099. The cubic root of 136921872 is about 515.4156596525.

The spelling of 136921872 in words is "one hundred thirty-six million, nine hundred twenty-one thousand, eight hundred seventy-two".