394043940 has 144 divisors (see below), whose sum is σ = 1254839040. Its totient is φ = 103783680.

The previous prime is 394043933. The next prime is 394043953. The reversal of 394043940 is 49340493.

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

It is a junction number, because it is equal to n+sod(n) for n = 394043895 and 394043904.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 432085 + ... + 432995.

It is an arithmetic number, because the mean of its divisors is an integer number (8714160).

Almost surely, 2^394043940 is an apocalyptic number.

394043940 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 394043940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627419520).

394043940 is an abundant number, since it is smaller than the sum of its proper divisors (860795100).

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

394043940 is a wasteful number, since it uses less digits than its factorization.

394043940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 394043940 is about 19850.5400430316. The cubic root of 394043940 is about 733.1309446081.

The spelling of 394043940 in words is "three hundred ninety-four million, forty-three thousand, nine hundred forty".