18899371 has 2 divisors, whose sum is σ = 18899372. Its totient is φ = 18899370.

The previous prime is 18899369. The next prime is 18899381. The reversal of 18899371 is 17399881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18899371 - 2¹ = 18899369 is a prime.

Together with 18899369, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18899351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449685 + 9449686.

It is an arithmetic number, because the mean of its divisors is an integer number (9449686).

Almost surely, 2^18899371 is an apocalyptic number.

18899371 is a deficient number, since it is larger than the sum of its proper divisors (1).

18899371 is an equidigital number, since it uses as much as digits as its factorization.

18899371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 46.

The square root of 18899371 is about 4347.3406813821. The cubic root of 18899371 is about 266.3682455079.

The spelling of 18899371 in words is "eighteen million, eight hundred ninety-nine thousand, three hundred seventy-one".