136404491 has 8 divisors (see below), whose sum is σ = 137932704. Its totient is φ = 134884800.

The previous prime is 136404469. The next prime is 136404497. The reversal of 136404491 is 194404631.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 136404491 - 2⁶ = 136404427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136404497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33245 + ... + 37121.

It is an arithmetic number, because the mean of its divisors is an integer number (17241588).

Almost surely, 2^136404491 is an apocalyptic number.

136404491 is a deficient number, since it is larger than the sum of its proper divisors (1528213).

136404491 is a wasteful number, since it uses less digits than its factorization.

136404491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 136404491 is about 11679.2333224403. The cubic root of 136404491 is about 514.7656469782.

The spelling of 136404491 in words is "one hundred thirty-six million, four hundred four thousand, four hundred ninety-one".