13138472 has 8 divisors (see below), whose sum is σ = 24634650. Its totient is φ = 6569232.

The previous prime is 13138471. The next prime is 13138487. The reversal of 13138472 is 27483131.

It can be written as a sum of positive squares in only one way, i.e., 7540516 + 5597956 = 2746^2 + 2366^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (13138471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821147 + ... + 821162.

Almost surely, 2^13138472 is an apocalyptic number.

It is an amenable number.

13138472 is a deficient number, since it is larger than the sum of its proper divisors (11496178).

13138472 is a wasteful number, since it uses less digits than its factorization.

13138472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642315 (or 1642311 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 13138472 is about 3624.7030223178. The cubic root of 13138472 is about 235.9653784317.

The spelling of 13138472 in words is "thirteen million, one hundred thirty-eight thousand, four hundred seventy-two".