394292220 has 288 divisors, whose sum is σ = 1423070208. Its totient is φ = 81134592.

The previous prime is 394292219. The next prime is 394292231. The reversal of 394292220 is 22292493.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17143129 + ... + 17143151.

It is an arithmetic number, because the mean of its divisors is an integer number (4941216).

Almost surely, 2^394292220 is an apocalyptic number.

394292220 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 394292220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711535104).

394292220 is an abundant number, since it is smaller than the sum of its proper divisors (1028777988).

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

394292220 is a wasteful number, since it uses less digits than its factorization.

394292220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 394292220 is about 19856.7927923922. The cubic root of 394292220 is about 733.2848898210.

The spelling of 394292220 in words is "three hundred ninety-four million, two hundred ninety-two thousand, two hundred twenty".