13001989 has 32 divisors (see below), whose sum is σ = 18063360. Its totient is φ = 9028800.

The previous prime is 13001981. The next prime is 13001993. The reversal of 13001989 is 98910031.

It is not a de Polignac number, because 13001989 - 2³ = 13001981 is a prime.

It is a super-2 number, since 2×13001989² = 338103435912242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 13001989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13001981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30822 + ... + 31240.

It is an arithmetic number, because the mean of its divisors is an integer number (564480).

Almost surely, 2^13001989 is an apocalyptic number.

It is an amenable number.

13001989 is a deficient number, since it is larger than the sum of its proper divisors (5061371).

13001989 is a wasteful number, since it uses less digits than its factorization.

13001989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 13001989 is about 3605.8270895871. The cubic root of 13001989 is about 235.1454599675.

The spelling of 13001989 in words is "thirteen million, one thousand, nine hundred eighty-nine".