42001660 has 48 divisors (see below), whose sum is σ = 91355040. Its totient is φ = 16208640.

The previous prime is 42001651. The next prime is 42001667. The reversal of 42001660 is 6610024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42001667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156006 + ... + 156274.

It is an arithmetic number, because the mean of its divisors is an integer number (1903230).

Almost surely, 2^42001660 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 42001660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45677520).

42001660 is an abundant number, since it is smaller than the sum of its proper divisors (49353380).

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

42001660 is a wasteful number, since it uses less digits than its factorization.

42001660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 42001660 is about 6480.8687689229. The cubic root of 42001660 is about 347.6072439555.

Adding to 42001660 its reverse (6610024), we get a palindrome (48611684).

The spelling of 42001660 in words is "forty-two million, one thousand, six hundred sixty".