18898907 has 4 divisors (see below), whose sum is σ = 18912840. Its totient is φ = 18884976.

The previous prime is 18898861. The next prime is 18898921. The reversal of 18898907 is 70989881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70989881 = 47 ⋅1510423.

It is a cyclic number.

It is not a de Polignac number, because 18898907 - 2⁶ = 18898843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18898927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4682 + ... + 7727.

It is an arithmetic number, because the mean of its divisors is an integer number (4728210).

Almost surely, 2^18898907 is an apocalyptic number.

18898907 is a deficient number, since it is larger than the sum of its proper divisors (13933).

18898907 is a wasteful number, since it uses less digits than its factorization.

18898907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13932.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 18898907 is about 4347.2873150966. The cubic root of 18898907 is about 266.3660656139.

The spelling of 18898907 in words is "eighteen million, eight hundred ninety-eight thousand, nine hundred seven".