18189379 has 4 divisors (see below), whose sum is σ = 19588576. Its totient is φ = 16790184.

The previous prime is 18189377. The next prime is 18189397. The reversal of 18189379 is 97398181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97398181 = 293 ⋅332417.

It is a cyclic number.

It is not a de Polignac number, because 18189379 - 2¹ = 18189377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18189373) 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, 699579 + ... + 699604.

It is an arithmetic number, because the mean of its divisors is an integer number (4897144).

Almost surely, 2^18189379 is an apocalyptic number.

18189379 is a deficient number, since it is larger than the sum of its proper divisors (1399197).

18189379 is a wasteful number, since it uses less digits than its factorization.

18189379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399196.

The product of its digits is 108864, while the sum is 46.

The square root of 18189379 is about 4264.9008194799. The cubic root of 18189379 is about 262.9900336935.

The spelling of 18189379 in words is "eighteen million, one hundred eighty-nine thousand, three hundred seventy-nine".