18904413 has 16 divisors (see below), whose sum is σ = 28694016. Its totient is φ = 10958640.

The previous prime is 18904409. The next prime is 18904421. The reversal of 18904413 is 31440981.

It is a happy number.

It is not a de Polignac number, because 18904413 - 2² = 18904409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18904423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11695 + ... + 13212.

It is an arithmetic number, because the mean of its divisors is an integer number (1793376).

Almost surely, 2^18904413 is an apocalyptic number.

It is an amenable number.

18904413 is a deficient number, since it is larger than the sum of its proper divisors (9789603).

18904413 is a wasteful number, since it uses less digits than its factorization.

18904413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24944.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18904413 is about 4347.9205374524. The cubic root of 18904413 is about 266.3919307632.

The spelling of 18904413 in words is "eighteen million, nine hundred four thousand, four hundred thirteen".