13642389 has 6 divisors (see below), whose sum is σ = 19705686. Its totient is φ = 9094920.

The previous prime is 13642357. The next prime is 13642423. The reversal of 13642389 is 98324631.

13642389 is a `hidden beast` number, since 1 + 3 + 642 + 3 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13264164 + 378225 = 3642^2 + 615^2 .

It is not a de Polignac number, because 13642389 - 2⁵ = 13642357 is a prime.

It is a super-2 number, since 2×13642389² = 372229555254642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13642319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 757902 + ... + 757919.

It is an arithmetic number, because the mean of its divisors is an integer number (3284281).

Almost surely, 2^13642389 is an apocalyptic number.

It is an amenable number.

13642389 is a deficient number, since it is larger than the sum of its proper divisors (6063297).

13642389 is a wasteful number, since it uses less digits than its factorization.

13642389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515827 (or 1515824 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 13642389 is about 3693.5604773714. The cubic root of 13642389 is about 238.9443741158.

The spelling of 13642389 in words is "thirteen million, six hundred forty-two thousand, three hundred eighty-nine".