18521494 has 8 divisors (see below), whose sum is σ = 27811440. Its totient is φ = 9251016.

The previous prime is 18521479. The next prime is 18521507. The reversal of 18521494 is 49412581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (3476430).

Almost surely, 2^18521494 is an apocalyptic number.

18521494 is a deficient number, since it is larger than the sum of its proper divisors (9289946).

18521494 is a wasteful number, since it uses less digits than its factorization.

18521494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9734.

The product of its digits is 11520, while the sum is 34.

The square root of 18521494 is about 4303.6605349400. The cubic root of 18521494 is about 264.5810110832.

The spelling of 18521494 in words is "eighteen million, five hundred twenty-one thousand, four hundred ninety-four".