18889013 has 16 divisors (see below), whose sum is σ = 22912512. Its totient is φ = 15336000.

The previous prime is 18889009. The next prime is 18889019. The reversal of 18889013 is 31098881.

It is a cyclic number.

It is not a de Polignac number, because 18889013 - 2² = 18889009 is a prime.

It is a super-2 number, since 2×18889013² = 713589624228338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18889019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2303 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (1432032).

Almost surely, 2^18889013 is an apocalyptic number.

18889013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18889013 is a deficient number, since it is larger than the sum of its proper divisors (4023499).

18889013 is a wasteful number, since it uses less digits than its factorization.

18889013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4316.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 18889013 is about 4346.1492151099. The cubic root of 18889013 is about 266.3195746380.

It can be divided in two parts, 1888 and 9013, that added together give a palindrome (10901).

The spelling of 18889013 in words is "eighteen million, eight hundred eighty-nine thousand, thirteen".