394181316 has 45 divisors (see below), whose sum is σ = 1031402911. Its totient is φ = 131274648.

The previous prime is 394181297. The next prime is 394181321. The reversal of 394181316 is 613181493.

The square root of 394181316 is 19854.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 356821 + ... + 357923.

Almost surely, 2^394181316 is an apocalyptic number.

394181316 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

394181316 is the 19854-th square number.

It is an amenable number.

394181316 is an abundant number, since it is smaller than the sum of its proper divisors (637221595).

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

394181316 is an equidigital number, since it uses as much as digits as its factorization.

394181316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222 (or 1108 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The cubic root of 394181316 is about 733.2161321423.

Multiplying 394181316 by its sum of digits (36), we get a square (14190527376 = 119124²).

394181316 divided by its sum of digits (36) gives a square (10949481 = 3309²).

The spelling of 394181316 in words is "three hundred ninety-four million, one hundred eighty-one thousand, three hundred sixteen".