18890897 has 4 divisors (see below), whose sum is σ = 18973620. Its totient is φ = 18808176.

The previous prime is 18890887. The next prime is 18890909. The reversal of 18890897 is 79809881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8386816 + 10504081 = 2896^2 + 3241^2 .

It is a cyclic number.

It is not a de Polignac number, because 18890897 - 2⁴ = 18890881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18890887) 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, 41018 + ... + 41475.

It is an arithmetic number, because the mean of its divisors is an integer number (4743405).

Almost surely, 2^18890897 is an apocalyptic number.

It is an amenable number.

18890897 is a deficient number, since it is larger than the sum of its proper divisors (82723).

18890897 is an equidigital number, since it uses as much as digits as its factorization.

18890897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82722.

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

The square root of 18890897 is about 4346.3659532994. The cubic root of 18890897 is about 266.3284286280.

The spelling of 18890897 in words is "eighteen million, eight hundred ninety thousand, eight hundred ninety-seven".