13631989 has 8 divisors (see below), whose sum is σ = 15942080. Its totient is φ = 11412576.

The previous prime is 13631983. The next prime is 13631993. The reversal of 13631989 is 98913631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13631989 - 2⁵ = 13631957 is a prime.

It is a super-2 number, since 2×13631989² = 371662248192242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13631983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22344 + ... + 22945.

It is an arithmetic number, because the mean of its divisors is an integer number (1992760).

Almost surely, 2^13631989 is an apocalyptic number.

It is an amenable number.

13631989 is a deficient number, since it is larger than the sum of its proper divisors (2310091).

13631989 is an equidigital number, since it uses as much as digits as its factorization.

13631989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45339.

The product of its digits is 34992, while the sum is 40.

The square root of 13631989 is about 3692.1523533029. The cubic root of 13631989 is about 238.8836405393.

The spelling of 13631989 in words is "thirteen million, six hundred thirty-one thousand, nine hundred eighty-nine".