18986394 has 32 divisors (see below), whose sum is σ = 44015616. Its totient is φ = 5347440.

The previous prime is 18986381. The next prime is 18986423. The reversal of 18986394 is 49368981.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202 + ... + 6165.

It is an arithmetic number, because the mean of its divisors is an integer number (1375488).

Almost surely, 2^18986394 is an apocalyptic number.

18986394 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 18986394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22007808).

18986394 is an abundant number, since it is smaller than the sum of its proper divisors (25029222).

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

18986394 is a wasteful number, since it uses less digits than its factorization.

18986394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6450.

The product of its digits is 373248, while the sum is 48.

The square root of 18986394 is about 4357.3379487940. The cubic root of 18986394 is about 266.7764544465.

The spelling of 18986394 in words is "eighteen million, nine hundred eighty-six thousand, three hundred ninety-four".