13231404 has 48 divisors (see below), whose sum is σ = 34671840. Its totient is φ = 4363200.

The previous prime is 13231373. The next prime is 13231411. The reversal of 13231404 is 40413231.

13231404 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13231404² = 350140103622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10302 + ... + 11514.

It is an arithmetic number, because the mean of its divisors is an integer number (722330).

Almost surely, 2^13231404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13231404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17335920).

13231404 is an abundant number, since it is smaller than the sum of its proper divisors (21440436).

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

13231404 is a wasteful number, since it uses less digits than its factorization.

13231404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 13231404 is about 3637.4996907216. The cubic root of 13231404 is about 236.5204210100.

13231404 divided by its sum of digits (18) gives a triangular number (735078 = T₁₂₁₂).

Adding to 13231404 its reverse (40413231), we get a palindrome (53644635).

The spelling of 13231404 in words is "thirteen million, two hundred thirty-one thousand, four hundred four".