136139866 has 8 divisors (see below), whose sum is σ = 204261300. Its totient is φ = 68052768.

The previous prime is 136139863. The next prime is 136139867. The reversal of 136139866 is 668931631.

It can be written as a sum of positive squares in 2 ways, for example, as 132917841 + 3222025 = 11529^2 + 1795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×136139866² = 37068126228995912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136139863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6960 + ... + 17908.

Almost surely, 2^136139866 is an apocalyptic number.

136139866 is a deficient number, since it is larger than the sum of its proper divisors (68121434).

136139866 is a wasteful number, since it uses less digits than its factorization.

136139866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17168.

The product of its digits is 139968, while the sum is 43.

The square root of 136139866 is about 11667.8989539677. The cubic root of 136139866 is about 514.4325493352.

The spelling of 136139866 in words is "one hundred thirty-six million, one hundred thirty-nine thousand, eight hundred sixty-six".