18909995 has 8 divisors (see below), whose sum is σ = 24437616. Its totient is φ = 13964256.

The previous prime is 18909991. The next prime is 18910007. The reversal of 18909995 is 59990981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18909995 - 2² = 18909991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18909991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145397 + ... + 145526.

It is an arithmetic number, because the mean of its divisors is an integer number (3054702).

Almost surely, 2^18909995 is an apocalyptic number.

18909995 is a deficient number, since it is larger than the sum of its proper divisors (5527621).

18909995 is a wasteful number, since it uses less digits than its factorization.

18909995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290941.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 18909995 is about 4348.5624061292. The cubic root of 18909995 is about 266.4181478061.

The spelling of 18909995 in words is "eighteen million, nine hundred nine thousand, nine hundred ninety-five".