394695440 has 40 divisors (see below), whose sum is σ = 925809048. Its totient is φ = 156477440.

The previous prime is 394695421. The next prime is 394695449. The reversal of 394695440 is 44596493.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18800896 + 375894544 = 4336^2 + 19388^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 394695391 and 394695400.

It is not an unprimeable number, because it can be changed into a prime (394695449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12791 + ... + 30870.

Almost surely, 2^394695440 is an apocalyptic number.

It is an amenable number.

394695440 is an abundant number, since it is smaller than the sum of its proper divisors (531113608).

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

394695440 is a wasteful number, since it uses less digits than its factorization.

394695440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43787 (or 43781 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 394695440 is about 19866.9433985201. The cubic root of 394695440 is about 733.5347674376.

The spelling of 394695440 in words is "three hundred ninety-four million, six hundred ninety-five thousand, four hundred forty".