3997520 has 40 divisors (see below), whose sum is σ = 9401184. Its totient is φ = 1580672.

The previous prime is 3997507. The next prime is 3997547. The reversal of 3997520 is 257993.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8327 + ... + 8793.

Almost surely, 2^3997520 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 3997520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4700592).

3997520 is an abundant number, since it is smaller than the sum of its proper divisors (5403664).

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

3997520 is a wasteful number, since it uses less digits than its factorization.

3997520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 3997520 is about 1999.3799038702. The cubic root of 3997520 is about 158.7072921261.

The spelling of 3997520 in words is "three million, nine hundred ninety-seven thousand, five hundred twenty".