18889379 has 2 divisors, whose sum is σ = 18889380. Its totient is φ = 18889378.

The previous prime is 18889369. The next prime is 18889391. The reversal of 18889379 is 97398881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18889379 - 2¹⁶ = 18823843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18889379.

It is not a weakly prime, because it can be changed into another prime (18889309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444689 + 9444690.

It is an arithmetic number, because the mean of its divisors is an integer number (9444690).

Almost surely, 2^18889379 is an apocalyptic number.

18889379 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889379 is an equidigital number, since it uses as much as digits as its factorization.

18889379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 18889379 is about 4346.1913211454. The cubic root of 18889379 is about 266.3212947267.

The spelling of 18889379 in words is "eighteen million, eight hundred eighty-nine thousand, three hundred seventy-nine".