394989420 has 96 divisors (see below), whose sum is σ = 1266725376. Its totient is φ = 90086400.

The previous prime is 394989409. The next prime is 394989437. The reversal of 394989420 is 24989493.

It is a self number, because there is not a number n which added to its sum of digits gives 394989420.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289540 + ... + 290900.

It is an arithmetic number, because the mean of its divisors is an integer number (13195056).

Almost surely, 2^394989420 is an apocalyptic number.

394989420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394989420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (633362688).

394989420 is an abundant number, since it is smaller than the sum of its proper divisors (871735956).

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

394989420 is a wasteful number, since it uses less digits than its factorization.

394989420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2069 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 394989420 is about 19874.3407437832. The cubic root of 394989420 is about 733.7168411852.

The spelling of 394989420 in words is "three hundred ninety-four million, nine hundred eighty-nine thousand, four hundred twenty".