18739389 has 16 divisors (see below), whose sum is σ = 26706240. Its totient is φ = 11646720.

The previous prime is 18739381. The next prime is 18739421. The reversal of 18739389 is 98393781.

It is not a de Polignac number, because 18739389 - 2³ = 18739381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18739381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3874 + ... + 7244.

It is an arithmetic number, because the mean of its divisors is an integer number (1669140).

Almost surely, 2^18739389 is an apocalyptic number.

It is an amenable number.

18739389 is a deficient number, since it is larger than the sum of its proper divisors (7966851).

18739389 is a wasteful number, since it uses less digits than its factorization.

18739389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500.

The product of its digits is 326592, while the sum is 48.

The square root of 18739389 is about 4328.9015927831. The cubic root of 18739389 is about 265.6145178609.

The spelling of 18739389 in words is "eighteen million, seven hundred thirty-nine thousand, three hundred eighty-nine".