136404387 has 36 divisors (see below), whose sum is σ = 234108576. Its totient is φ = 76275360.

The previous prime is 136404377. The next prime is 136404391. The reversal of 136404387 is 783404631.

136404387 is a `hidden beast` number, since 1 + 3 + 640 + 4 + 3 + 8 + 7 = 666.

It is not a de Polignac number, because 136404387 - 2⁷ = 136404259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136404347) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17437 + ... + 24017.

It is an arithmetic number, because the mean of its divisors is an integer number (6503016).

Almost surely, 2^136404387 is an apocalyptic number.

136404387 is a deficient number, since it is larger than the sum of its proper divisors (97704189).

136404387 is a wasteful number, since it uses less digits than its factorization.

136404387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6648 (or 6638 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 136404387 is about 11679.2288700924. The cubic root of 136404387 is about 514.7655161525.

The spelling of 136404387 in words is "one hundred thirty-six million, four hundred four thousand, three hundred eighty-seven".