136521404 has 12 divisors (see below), whose sum is σ = 239282904. Its totient is φ = 68154864.

The previous prime is 136521377. The next prime is 136521409. The reversal of 136521404 is 404125631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136521409) 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, 23522 + ... + 28745.

It is an arithmetic number, because the mean of its divisors is an integer number (19940242).

Almost surely, 2^136521404 is an apocalyptic number.

It is an amenable number.

136521404 is a deficient number, since it is larger than the sum of its proper divisors (102761500).

136521404 is a wasteful number, since it uses less digits than its factorization.

136521404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52924 (or 52922 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 136521404 is about 11684.2374162801. The cubic root of 136521404 is about 514.9126744197.

The spelling of 136521404 in words is "one hundred thirty-six million, five hundred twenty-one thousand, four hundred four".