18901399 has 16 divisors (see below), whose sum is σ = 22203936. Its totient is φ = 15897600.

The previous prime is 18901391. The next prime is 18901411. The reversal of 18901399 is 99310981.

It is a cyclic number.

It is not a de Polignac number, because 18901399 - 2³ = 18901391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18901391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10579 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (1387746).

Almost surely, 2^18901399 is an apocalyptic number.

18901399 is a deficient number, since it is larger than the sum of its proper divisors (3302537).

18901399 is a wasteful number, since it uses less digits than its factorization.

18901399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 18901399 is about 4347.5739211657. The cubic root of 18901399 is about 266.3777727294.

The spelling of 18901399 in words is "eighteen million, nine hundred one thousand, three hundred ninety-nine".