18453994 has 8 divisors (see below), whose sum is σ = 29810340. Its totient is φ = 8517216.

The previous prime is 18453991. The next prime is 18454003. The reversal of 18453994 is 49935481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18378369 + 75625 = 4287^2 + 275^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18453994.

It is not an unprimeable number, because it can be changed into a prime (18453991) 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 3 ways as a sum of consecutive naturals, for example, 354859 + ... + 354910.

Almost surely, 2^18453994 is an apocalyptic number.

18453994 is a deficient number, since it is larger than the sum of its proper divisors (11356346).

18453994 is a wasteful number, since it uses less digits than its factorization.

18453994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709784.

The product of its digits is 155520, while the sum is 43.

The square root of 18453994 is about 4295.8112155913. The cubic root of 18453994 is about 264.2592055502.

The spelling of 18453994 in words is "eighteen million, four hundred fifty-three thousand, nine hundred ninety-four".