13157444 has 6 divisors (see below), whose sum is σ = 23025534. Its totient is φ = 6578720.

The previous prime is 13157437. The next prime is 13157453. The reversal of 13157444 is 44475131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12517444 + 640000 = 3538^2 + 800^2 .

It is a super-3 number, since 3×13157444³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1644677 + ... + 1644684.

It is an arithmetic number, because the mean of its divisors is an integer number (3837589).

Almost surely, 2^13157444 is an apocalyptic number.

It is an amenable number.

13157444 is a deficient number, since it is larger than the sum of its proper divisors (9868090).

13157444 is a wasteful number, since it uses less digits than its factorization.

13157444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289365 (or 3289363 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 13157444 is about 3627.3191202319. The cubic root of 13157444 is about 236.0789020865.

It can be divided in two parts, 131 and 57444, that added together give a palindrome (57575).

The spelling of 13157444 in words is "thirteen million, one hundred fifty-seven thousand, four hundred forty-four".