401681660 has 48 divisors (see below), whose sum is σ = 926553600. Its totient is φ = 145594944.

The previous prime is 401681659. The next prime is 401681681. The reversal of 401681660 is 66186104.

It is a happy number.

It is a super-2 number, since 2×401681660² = 322696311960711200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14240 + ... + 31719.

It is an arithmetic number, because the mean of its divisors is an integer number (19303200).

Almost surely, 2^401681660 is an apocalyptic number.

It is an amenable number.

401681660 is an abundant number, since it is smaller than the sum of its proper divisors (524871940).

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

401681660 is a wasteful number, since it uses less digits than its factorization.

401681660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46010 (or 46008 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 401681660 is about 20041.9974054484. The cubic root of 401681660 is about 737.8374041710.

The spelling of 401681660 in words is "four hundred one million, six hundred eighty-one thousand, six hundred sixty".