18713394 has 60 divisors (see below), whose sum is σ = 47409726. Its totient is φ = 5334336.

The previous prime is 18713393. The next prime is 18713411. The reversal of 18713394 is 49331781.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18173169 + 540225 = 4263^2 + 735^2 .

It is a super-2 number, since 2×18713394² = 700382229998472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713393) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 43002 + ... + 43434.

Almost surely, 2^18713394 is an apocalyptic number.

18713394 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 18713394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23704863).

18713394 is an abundant number, since it is smaller than the sum of its proper divisors (28696332).

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

18713394 is an equidigital number, since it uses as much as digits as its factorization.

18713394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 445 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18713394 is about 4325.8980570513. The cubic root of 18713394 is about 265.4916421981.

The spelling of 18713394 in words is "eighteen million, seven hundred thirteen thousand, three hundred ninety-four".