3457840 has 20 divisors (see below), whose sum is σ = 8039664. Its totient is φ = 1383104.

The previous prime is 3457819. The next prime is 3457841. The reversal of 3457840 is 487543.

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

It is not an unprimeable number, because it can be changed into a prime (3457841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21532 + ... + 21691.

Almost surely, 2^3457840 is an apocalyptic number.

It is an amenable number.

3457840 is an abundant number, since it is smaller than the sum of its proper divisors (4581824).

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

3457840 is a wasteful number, since it uses less digits than its factorization.

3457840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43236 (or 43230 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 3457840 is about 1859.5268215328. The cubic root of 3457840 is about 151.2173528790.

The spelling of 3457840 in words is "three million, four hundred fifty-seven thousand, eight hundred forty".