13557444 has 12 divisors (see below), whose sum is σ = 31634064. Its totient is φ = 4519144.

The previous prime is 13557437. The next prime is 13557451. The reversal of 13557444 is 44475531.

It is an interprime number because it is at equal distance from previous prime (13557437) and next prime (13557451).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564882 + ... + 564905.

It is an arithmetic number, because the mean of its divisors is an integer number (2636172).

Almost surely, 2^13557444 is an apocalyptic number.

It is an amenable number.

13557444 is an abundant number, since it is smaller than the sum of its proper divisors (18076620).

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

13557444 is a wasteful number, since it uses less digits than its factorization.

13557444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129794 (or 1129792 counting only the distinct ones).

The product of its digits is 33600, while the sum is 33.

The square root of 13557444 is about 3682.0434543878. The cubic root of 13557444 is about 238.4474082932.

The spelling of 13557444 in words is "thirteen million, five hundred fifty-seven thousand, four hundred forty-four".