18963813 has 16 divisors (see below), whose sum is σ = 27662400. Its totient is φ = 11460480.

The previous prime is 18963809. The next prime is 18963827. The reversal of 18963813 is 31836981.

It is not a de Polignac number, because 18963813 - 2² = 18963809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18763813) 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, 16233 + ... + 17361.

It is an arithmetic number, because the mean of its divisors is an integer number (1728900).

Almost surely, 2^18963813 is an apocalyptic number.

It is an amenable number.

18963813 is a deficient number, since it is larger than the sum of its proper divisors (8698587).

18963813 is a wasteful number, since it uses less digits than its factorization.

18963813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its digits is 31104, while the sum is 39.

The square root of 18963813 is about 4354.7460316303. The cubic root of 18963813 is about 266.6706511557.

The spelling of 18963813 in words is "eighteen million, nine hundred sixty-three thousand, eight hundred thirteen".