131236404 has 24 divisors (see below), whose sum is σ = 329773920. Its totient is φ = 40380384.

The previous prime is 131236393. The next prime is 131236421. The reversal of 131236404 is 404632131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420474 + ... + 420785.

It is an arithmetic number, because the mean of its divisors is an integer number (13740580).

Almost surely, 2^131236404 is an apocalyptic number.

It is an amenable number.

131236404 is an abundant number, since it is smaller than the sum of its proper divisors (198537516).

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

131236404 is a wasteful number, since it uses less digits than its factorization.

131236404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841279 (or 841277 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 131236404 is about 11455.8458439349. The cubic root of 131236404 is about 508.1806299604.

Adding to 131236404 its reverse (404632131), we get a palindrome (535868535).

The spelling of 131236404 in words is "one hundred thirty-one million, two hundred thirty-six thousand, four hundred four".