4001660 has 24 divisors (see below), whose sum is σ = 9050496. Its totient is φ = 1477440.

The previous prime is 4001639. The next prime is 4001689. The reversal of 4001660 is 661004.

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, 7436 + ... + 7955.

It is an arithmetic number, because the mean of its divisors is an integer number (377104).

Almost surely, 2^4001660 is an apocalyptic number.

It is an amenable number.

4001660 is an abundant number, since it is smaller than the sum of its proper divisors (5048836).

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

4001660 is a wasteful number, since it uses less digits than its factorization.

4001660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15413 (or 15411 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 4001660 is about 2000.4149569527. The cubic root of 4001660 is about 158.7620612077.

Adding to 4001660 its reverse (661004), we get a palindrome (4662664).

The spelling of 4001660 in words is "four million, one thousand, six hundred sixty".