394625840 has 80 divisors (see below), whose sum is σ = 1051456512. Its totient is φ = 134929152.

The previous prime is 394625827. The next prime is 394625849. The reversal of 394625840 is 48526493.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (394625849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271997 + ... + 273443.

Almost surely, 2^394625840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394625840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (525728256).

394625840 is an abundant number, since it is smaller than the sum of its proper divisors (656830672).

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

394625840 is a wasteful number, since it uses less digits than its factorization.

394625840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954 (or 1948 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 394625840 is about 19865.1916678395. The cubic root of 394625840 is about 733.4916480973.

The spelling of 394625840 in words is "three hundred ninety-four million, six hundred twenty-five thousand, eight hundred forty".