18897039 has 24 divisors (see below), whose sum is σ = 32839040. Its totient is φ = 10229328.

The previous prime is 18897031. The next prime is 18897049. The reversal of 18897039 is 93079881.

It is not a de Polignac number, because 18897039 - 2³ = 18897031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18896985 and 18897003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6697 + ... + 9090.

Almost surely, 2^18897039 is an apocalyptic number.

18897039 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18897039 is a deficient number, since it is larger than the sum of its proper divisors (13942001).

18897039 is a wasteful number, since it uses less digits than its factorization.

18897039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15819 (or 15816 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18897039 is about 4347.0724631641. The cubic root of 18897039 is about 266.3572893003.

The spelling of 18897039 in words is "eighteen million, eight hundred ninety-seven thousand, thirty-nine".