17994431 has 8 divisors (see below), whose sum is σ = 22147104. Its totient is φ = 14237280.

The previous prime is 17994421. The next prime is 17994433. The reversal of 17994431 is 13449971.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17994431 is a prime.

It is a super-2 number, since 2×17994431² = 647599094027522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17994433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98780 + ... + 98961.

It is an arithmetic number, because the mean of its divisors is an integer number (2768388).

Almost surely, 2^17994431 is an apocalyptic number.

17994431 is a deficient number, since it is larger than the sum of its proper divisors (4152673).

17994431 is a wasteful number, since it uses less digits than its factorization.

17994431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197761.

The product of its digits is 27216, while the sum is 38.

The square root of 17994431 is about 4241.9843234034. The cubic root of 17994431 is about 262.0471090241.

The spelling of 17994431 in words is "seventeen million, nine hundred ninety-four thousand, four hundred thirty-one".