13031604 has 84 divisors (see below), whose sum is σ = 35347620. Its totient is φ = 4199040.

The previous prime is 13031561. The next prime is 13031617. The reversal of 13031604 is 40613031.

13031604 is a `hidden beast` number, since 1 + 30 + 31 + 604 = 666.

13031604 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 can be written as a sum of positive squares in 2 ways, for example, as 4210704 + 8820900 = 2052^2 + 2970^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 119502 + ... + 119610.

It is an arithmetic number, because the mean of its divisors is an integer number (420805).

Almost surely, 2^13031604 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 13031604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17673810).

13031604 is an abundant number, since it is smaller than the sum of its proper divisors (22316016).

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

13031604 is a wasteful number, since it uses less digits than its factorization.

13031604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 13031604 is about 3609.9313012854. The cubic root of 13031604 is about 235.3238570890.

Adding to 13031604 its reverse (40613031), we get a palindrome (53644635).

The spelling of 13031604 in words is "thirteen million, thirty-one thousand, six hundred four".