394047720 has 256 divisors, whose sum is σ = 1469664000. Its totient is φ = 93081600.

The previous prime is 394047691. The next prime is 394047749. The reversal of 394047720 is 27740493.

It is an interprime number because it is at equal distance from previous prime (394047691) and next prime (394047749).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 486676 + ... + 487484.

It is an arithmetic number, because the mean of its divisors is an integer number (5740875).

Almost surely, 2^394047720 is an apocalyptic number.

394047720 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 394047720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734832000).

394047720 is an abundant number, since it is smaller than the sum of its proper divisors (1075616280).

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

394047720 is a wasteful number, since it uses less digits than its factorization.

394047720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 871 counting only the distinct ones).

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

The square root of 394047720 is about 19850.6352543187. The cubic root of 394047720 is about 733.1332888696.

The spelling of 394047720 in words is "three hundred ninety-four million, forty-seven thousand, seven hundred twenty".