18349779 has 24 divisors (see below), whose sum is σ = 28986880. Its totient is φ = 10114272.

The previous prime is 18349757. The next prime is 18349829. The reversal of 18349779 is 97794381.

It is not a de Polignac number, because 18349779 - 2⁷ = 18349651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18349729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17142 + ... + 18180.

Almost surely, 2^18349779 is an apocalyptic number.

18349779 is a deficient number, since it is larger than the sum of its proper divisors (10637101).

18349779 is a wasteful number, since it uses less digits than its factorization.

18349779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1078 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 18349779 is about 4283.6642025257. The cubic root of 18349779 is about 263.7608169983.

The spelling of 18349779 in words is "eighteen million, three hundred forty-nine thousand, seven hundred seventy-nine".