18949199 has 4 divisors (see below), whose sum is σ = 18960936. Its totient is φ = 18937464.

The previous prime is 18949181. The next prime is 18949211. The reversal of 18949199 is 99194981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18949199 - 2¹² = 18945103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949109) 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, 2969 + ... + 6834.

It is an arithmetic number, because the mean of its divisors is an integer number (4740234).

Almost surely, 2^18949199 is an apocalyptic number.

18949199 is a deficient number, since it is larger than the sum of its proper divisors (11737).

18949199 is an equidigital number, since it uses as much as digits as its factorization.

18949199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736.

The product of its digits is 209952, while the sum is 50.

The square root of 18949199 is about 4353.0677688269. The cubic root of 18949199 is about 266.6021324741.

The spelling of 18949199 in words is "eighteen million, nine hundred forty-nine thousand, one hundred ninety-nine".