136776409 has 8 divisors (see below), whose sum is σ = 170526528. Its totient is φ = 106578960.

The previous prime is 136776403. The next prime is 136776427. The reversal of 136776409 is 904677631.

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 136776409 - 2³ = 136776401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136776401) 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, 888082 + ... + 888235.

It is an arithmetic number, because the mean of its divisors is an integer number (21315816).

Almost surely, 2^136776409 is an apocalyptic number.

It is an amenable number.

136776409 is a deficient number, since it is larger than the sum of its proper divisors (33750119).

136776409 is a wasteful number, since it uses less digits than its factorization.

136776409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776335.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 136776409 is about 11695.1446763176. The cubic root of 136776409 is about 515.2330726220.

The spelling of 136776409 in words is "one hundred thirty-six million, seven hundred seventy-six thousand, four hundred nine".