18693813 has 8 divisors (see below), whose sum is σ = 25075008. Its totient is φ = 12387584.

The previous prime is 18693811. The next prime is 18693817. The reversal of 18693813 is 31839681.

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 18693813 - 2¹ = 18693811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18693811) 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, 18156 + ... + 19157.

It is an arithmetic number, because the mean of its divisors is an integer number (3134376).

Almost surely, 2^18693813 is an apocalyptic number.

It is an amenable number.

18693813 is a deficient number, since it is larger than the sum of its proper divisors (6381195).

18693813 is a wasteful number, since it uses less digits than its factorization.

18693813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37483.

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

The square root of 18693813 is about 4323.6342352239. The cubic root of 18693813 is about 265.3990096857.

The spelling of 18693813 in words is "eighteen million, six hundred ninety-three thousand, eight hundred thirteen".