18953889 has 4 divisors (see below), whose sum is σ = 25271856. Its totient is φ = 12635924.

The previous prime is 18953867. The next prime is 18953899. The reversal of 18953889 is 98835981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98835981 = 3 ⋅32945327.

It is a cyclic number.

It is not a de Polignac number, because 18953889 - 2¹² = 18949793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18953839) 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, 3158979 + ... + 3158984.

It is an arithmetic number, because the mean of its divisors is an integer number (6317964).

Almost surely, 2^18953889 is an apocalyptic number.

It is an amenable number.

18953889 is a deficient number, since it is larger than the sum of its proper divisors (6317967).

18953889 is an equidigital number, since it uses as much as digits as its factorization.

18953889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6317966.

The product of its digits is 622080, while the sum is 51.

The square root of 18953889 is about 4353.6064360482. The cubic root of 18953889 is about 266.6241256791.

The spelling of 18953889 in words is "eighteen million, nine hundred fifty-three thousand, eight hundred eighty-nine".