18785913 has 16 divisors (see below), whose sum is σ = 25843776. Its totient is φ = 12130560.

The previous prime is 18785891. The next prime is 18785933. The reversal of 18785913 is 31958781.

It is not a de Polignac number, because 18785913 - 2⁶ = 18785849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18785933) 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, 19581 + ... + 20517.

It is an arithmetic number, because the mean of its divisors is an integer number (1615236).

Almost surely, 2^18785913 is an apocalyptic number.

It is an amenable number.

18785913 is a deficient number, since it is larger than the sum of its proper divisors (7057863).

18785913 is a wasteful number, since it uses less digits than its factorization.

18785913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144.

The product of its digits is 60480, while the sum is 42.

The square root of 18785913 is about 4334.2719111749. The cubic root of 18785913 is about 265.8341485962.

The spelling of 18785913 in words is "eighteen million, seven hundred eighty-five thousand, nine hundred thirteen".