18905913 has 32 divisors (see below), whose sum is σ = 30692480. Its totient is φ = 11430720.

The previous prime is 18905869. The next prime is 18905923. The reversal of 18905913 is 31950981.

It is a happy number.

It is not a de Polignac number, because 18905913 - 2⁹ = 18905401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18905923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20970 + ... + 21852.

It is an arithmetic number, because the mean of its divisors is an integer number (959140).

Almost surely, 2^18905913 is an apocalyptic number.

18905913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18905913 is a deficient number, since it is larger than the sum of its proper divisors (11786567).

18905913 is a wasteful number, since it uses less digits than its factorization.

18905913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 960 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 18905913 is about 4348.0930302835. The cubic root of 18905913 is about 266.3989763373.

The spelling of 18905913 in words is "eighteen million, nine hundred five thousand, nine hundred thirteen".