394144440 has 32 divisors (see below), whose sum is σ = 1182433680. Its totient is φ = 105105152.

The previous prime is 394144427. The next prime is 394144453. The reversal of 394144440 is 44441493.

It is an interprime number because it is at equal distance from previous prime (394144427) and next prime (394144453).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1642149 + ... + 1642388.

Almost surely, 2^394144440 is an apocalyptic number.

394144440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394144440 is an abundant number, since it is smaller than the sum of its proper divisors (788289240).

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

394144440 is a wasteful number, since it uses less digits than its factorization.

394144440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3284551 (or 3284547 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 394144440 is about 19853.0712989200. The cubic root of 394144440 is about 733.1932670967.

The spelling of 394144440 in words is "three hundred ninety-four million, one hundred forty-four thousand, four hundred forty".