18140989 has 16 divisors (see below), whose sum is σ = 19961856. Its totient is φ = 16416000.

The previous prime is 18140981. The next prime is 18141031. The reversal of 18140989 is 98904181.

It is a cyclic number.

It is not a de Polignac number, because 18140989 - 2³ = 18140981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140981) 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, 94884 + ... + 95074.

It is an arithmetic number, because the mean of its divisors is an integer number (1247616).

Almost surely, 2^18140989 is an apocalyptic number.

It is an amenable number.

18140989 is a deficient number, since it is larger than the sum of its proper divisors (1820867).

18140989 is a wasteful number, since it uses less digits than its factorization.

18140989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 18140989 is about 4259.2239903532. The cubic root of 18140989 is about 262.7566119497.

The spelling of 18140989 in words is "eighteen million, one hundred forty thousand, nine hundred eighty-nine".