18949769 has 4 divisors (see below), whose sum is σ = 19773696. Its totient is φ = 18125844.

The previous prime is 18949757. The next prime is 18949771. The reversal of 18949769 is 96794981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96794981 = 3373 ⋅28697.

It is a cyclic number.

It is not a de Polignac number, because 18949769 - 2⁴ = 18949753 is a prime.

It is a super-2 number, since 2×18949769² = 718187490306722, 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 18949769.

It is not an unprimeable number, because it can be changed into a prime (18949729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411929 + ... + 411974.

It is an arithmetic number, because the mean of its divisors is an integer number (4943424).

Almost surely, 2^18949769 is an apocalyptic number.

It is an amenable number.

18949769 is a deficient number, since it is larger than the sum of its proper divisors (823927).

18949769 is an equidigital number, since it uses as much as digits as its factorization.

18949769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823926.

The product of its digits is 979776, while the sum is 53.

The square root of 18949769 is about 4353.1332394035. The cubic root of 18949769 is about 266.6048056159.

The spelling of 18949769 in words is "eighteen million, nine hundred forty-nine thousand, seven hundred sixty-nine".