406440660 has 96 divisors (see below), whose sum is σ = 1158619392. Its totient is φ = 106444800.

The previous prime is 406440611. The next prime is 406440673. The reversal of 406440660 is 66044604.

406440660 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1023582 + ... + 1023978.

It is an arithmetic number, because the mean of its divisors is an integer number (12068952).

Almost surely, 2^406440660 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 406440660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579309696).

406440660 is an abundant number, since it is smaller than the sum of its proper divisors (752178732).

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

406440660 is a wasteful number, since it uses less digits than its factorization.

406440660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 406440660 is about 20160.3735084447. The cubic root of 406440660 is about 740.7398614428.

The spelling of 406440660 in words is "four hundred six million, four hundred forty thousand, six hundred sixty".