18949859 has 8 divisors (see below), whose sum is σ = 19995840. Its totient is φ = 17908776.

The previous prime is 18949841. The next prime is 18949867. The reversal of 18949859 is 95894981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18949859 is a prime.

It is a super-2 number, since 2×18949859² = 718194312239762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18949859.

It is not an unprimeable number, because it can be changed into a prime (18949159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8984 + ... + 10890.

It is an arithmetic number, because the mean of its divisors is an integer number (2499480).

Almost surely, 2^18949859 is an apocalyptic number.

18949859 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18949859 is a deficient number, since it is larger than the sum of its proper divisors (1045981).

18949859 is a wasteful number, since it uses less digits than its factorization.

18949859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449.

The product of its digits is 933120, while the sum is 53.

The square root of 18949859 is about 4353.1435767730. The cubic root of 18949859 is about 266.6052276861.

The spelling of 18949859 in words is "eighteen million, nine hundred forty-nine thousand, eight hundred fifty-nine".