18739669 has 16 divisors (see below), whose sum is σ = 20805120. Its totient is φ = 16773120.

The previous prime is 18739667. The next prime is 18739691. The reversal of 18739669 is 96693781.

It is not a de Polignac number, because 18739669 - 2¹ = 18739667 is a prime.

It is a super-2 number, since 2×18739669² = 702350388459122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18739663) 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, 72789 + ... + 73045.

It is an arithmetic number, because the mean of its divisors is an integer number (1300320).

Almost surely, 2^18739669 is an apocalyptic number.

It is an amenable number.

18739669 is a deficient number, since it is larger than the sum of its proper divisors (2065451).

18739669 is a wasteful number, since it uses less digits than its factorization.

18739669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 489888, while the sum is 49.

The square root of 18739669 is about 4328.9339334298. The cubic root of 18739669 is about 265.6158407730.

The spelling of 18739669 in words is "eighteen million, seven hundred thirty-nine thousand, six hundred sixty-nine".