394743240 has 128 divisors (see below), whose sum is σ = 1385136000. Its totient is φ = 99719424.

The previous prime is 394743233. The next prime is 394743263. The reversal of 394743240 is 42347493.

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 = 394743195 and 394743204.

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, 10902 + ... + 30138.

It is an arithmetic number, because the mean of its divisors is an integer number (10821375).

Almost surely, 2^394743240 is an apocalyptic number.

394743240 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 394743240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (692568000).

394743240 is an abundant number, since it is smaller than the sum of its proper divisors (990392760).

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

394743240 is a wasteful number, since it uses less digits than its factorization.

394743240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19276 (or 19266 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 394743240 is about 19868.1463654766. The cubic root of 394743240 is about 733.5643780715.

The spelling of 394743240 in words is "three hundred ninety-four million, seven hundred forty-three thousand, two hundred forty".