3394640 has 20 divisors (see below), whose sum is σ = 7892724. Its totient is φ = 1357824.

The previous prime is 3394637. The next prime is 3394661. The reversal of 3394640 is 464933.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1577536 + 1817104 = 1256^2 + 1348^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21137 + ... + 21296.

Almost surely, 2^3394640 is an apocalyptic number.

It is an amenable number.

3394640 is an abundant number, since it is smaller than the sum of its proper divisors (4498084).

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

3394640 is a wasteful number, since it uses less digits than its factorization.

3394640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42446 (or 42440 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 3394640 is about 1842.4548841152. The cubic root of 3394640 is about 150.2904003843.

The spelling of 3394640 in words is "three million, three hundred ninety-four thousand, six hundred forty".