18945494 has 4 divisors (see below), whose sum is σ = 28418244. Its totient is φ = 9472746.

The previous prime is 18945469. The next prime is 18945503. The reversal of 18945494 is 49454981.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4736372 + ... + 4736375.

It is an arithmetic number, because the mean of its divisors is an integer number (7104561).

Almost surely, 2^18945494 is an apocalyptic number.

18945494 is a deficient number, since it is larger than the sum of its proper divisors (9472750).

18945494 is an equidigital number, since it uses as much as digits as its factorization.

18945494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9472749.

The product of its digits is 207360, while the sum is 44.

The square root of 18945494 is about 4352.6421860750. The cubic root of 18945494 is about 266.5847557451.

The spelling of 18945494 in words is "eighteen million, nine hundred forty-five thousand, four hundred ninety-four".