18534994 has 16 divisors (see below), whose sum is σ = 29350080. Its totient is φ = 8754480.

The previous prime is 18534991. The next prime is 18535003. The reversal of 18534994 is 49943581.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18534994.

It is not an unprimeable number, because it can be changed into a prime (18534991) 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 7 ways as a sum of consecutive naturals, for example, 23592 + ... + 24364.

It is an arithmetic number, because the mean of its divisors is an integer number (1834380).

Almost surely, 2^18534994 is an apocalyptic number.

18534994 is a deficient number, since it is larger than the sum of its proper divisors (10815086).

18534994 is a wasteful number, since it uses less digits than its factorization.

18534994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425.

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

The square root of 18534994 is about 4305.2286814988. The cubic root of 18534994 is about 264.6452783282.

The spelling of 18534994 in words is "eighteen million, five hundred thirty-four thousand, nine hundred ninety-four".