18715494 has 64 divisors (see below), whose sum is σ = 46080000. Its totient is φ = 4948128.

The previous prime is 18715493. The next prime is 18715547. The reversal of 18715494 is 49451781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18715493) 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 31 ways as a sum of consecutive naturals, for example, 37257 + ... + 37755.

It is an arithmetic number, because the mean of its divisors is an integer number (720000).

Almost surely, 2^18715494 is an apocalyptic number.

18715494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18715494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23040000).

18715494 is an abundant number, since it is smaller than the sum of its proper divisors (27364506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18715494 is a wasteful number, since it uses less digits than its factorization.

18715494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577.

The product of its digits is 40320, while the sum is 39.

The square root of 18715494 is about 4326.1407744085. The cubic root of 18715494 is about 265.5015729032.

The spelling of 18715494 in words is "eighteen million, seven hundred fifteen thousand, four hundred ninety-four".