136139868 has 18 divisors (see below), whose sum is σ = 344131424. Its totient is φ = 45379944.

The previous prime is 136139867. The next prime is 136139911. The reversal of 136139868 is 868931631.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 1890796 + ... + 1890867.

Almost surely, 2^136139868 is an apocalyptic number.

136139868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

136139868 is an abundant number, since it is smaller than the sum of its proper divisors (207991556).

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

136139868 is a wasteful number, since it uses less digits than its factorization.

136139868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3781673 (or 3781668 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 136139868 is about 11667.8990396729. The cubic root of 136139868 is about 514.4325518544.

The spelling of 136139868 in words is "one hundred thirty-six million, one hundred thirty-nine thousand, eight hundred sixty-eight".