3974840 has 16 divisors (see below), whose sum is σ = 8943480. Its totient is φ = 1589920.

The previous prime is 3974833. The next prime is 3974849. The reversal of 3974840 is 484793.

It is a self number, because there is not a number n which added to its sum of digits gives 3974840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3974849) 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, 49646 + ... + 49725.

Almost surely, 2^3974840 is an apocalyptic number.

It is an amenable number.

3974840 is an abundant number, since it is smaller than the sum of its proper divisors (4968640).

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

3974840 is a wasteful number, since it uses less digits than its factorization.

3974840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99382 (or 99378 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 3974840 is about 1993.7000777449. The cubic root of 3974840 is about 158.4065798375.

The spelling of 3974840 in words is "three million, nine hundred seventy-four thousand, eight hundred forty".