18398669 has 16 divisors (see below), whose sum is σ = 19992000. Its totient is φ = 16879104.

The previous prime is 18398659. The next prime is 18398671. The reversal of 18398669 is 96689381.

18398669 = 92² + 93² + ... + 382².

It is a cyclic number.

It is not a de Polignac number, because 18398669 - 2¹² = 18394573 is a prime.

It is a super-4 number, since 4×18398669⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398609) 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, 123407 + ... + 123555.

It is an arithmetic number, because the mean of its divisors is an integer number (1249500).

Almost surely, 2^18398669 is an apocalyptic number.

18398669 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18398669 is a deficient number, since it is larger than the sum of its proper divisors (1593331).

18398669 is a wasteful number, since it uses less digits than its factorization.

18398669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332.

The product of its digits is 559872, while the sum is 50.

The square root of 18398669 is about 4289.3669696122. The cubic root of 18398669 is about 263.9948585240.

The spelling of 18398669 in words is "eighteen million, three hundred ninety-eight thousand, six hundred sixty-nine".