3947440 has 120 divisors (see below), whose sum is σ = 11450160. Its totient is φ = 1257984.

The previous prime is 3947431. The next prime is 3947453. The reversal of 3947440 is 447493.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74454 + ... + 74506.

It is an arithmetic number, because the mean of its divisors is an integer number (95418).

Almost surely, 2^3947440 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 3947440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5725080).

3947440 is an abundant number, since it is smaller than the sum of its proper divisors (7502720).

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

3947440 is a wasteful number, since it uses less digits than its factorization.

3947440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 3947440 is about 1986.8165491560. The cubic root of 3947440 is about 158.0417557748.

The spelling of 3947440 in words is "three million, nine hundred forty-seven thousand, four hundred forty".