18909417 has 4 divisors (see below), whose sum is σ = 25212560. Its totient is φ = 12606276.

The previous prime is 18909413. The next prime is 18909431. The reversal of 18909417 is 71490981.

It is a happy number.

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.

It is not a de Polignac number, because 18909417 - 2² = 18909413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18909413) 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, 3151567 + ... + 3151572.

It is an arithmetic number, because the mean of its divisors is an integer number (6303140).

Almost surely, 2^18909417 is an apocalyptic number.

It is an amenable number.

18909417 is a deficient number, since it is larger than the sum of its proper divisors (6303143).

18909417 is an equidigital number, since it uses as much as digits as its factorization.

18909417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303142.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 18909417 is about 4348.4959468763. The cubic root of 18909417 is about 266.4154333464.

The spelling of 18909417 in words is "eighteen million, nine hundred nine thousand, four hundred seventeen".