394722720 has 480 divisors, whose sum is σ = 1683158400. Its totient is φ = 85100544.

The previous prime is 394722707. The next prime is 394722733. The reversal of 394722720 is 27227493.

It is an interprime number because it is at equal distance from previous prime (394722707) and next prime (394722733).

It is a tau number, because it is divible by the number of its divisors (480).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1723566 + ... + 1723794.

It is an arithmetic number, because the mean of its divisors is an integer number (3506580).

Almost surely, 2^394722720 is an apocalyptic number.

394722720 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 394722720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841579200).

394722720 is an abundant number, since it is smaller than the sum of its proper divisors (1288435680).

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

394722720 is a wasteful number, since it uses less digits than its factorization.

394722720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 394722720 is about 19867.6299542749. The cubic root of 394722720 is about 733.5516668537.

The spelling of 394722720 in words is "three hundred ninety-four million, seven hundred twenty-two thousand, seven hundred twenty".