6405980 has 24 divisors (see below), whose sum is σ = 15374688. Its totient is φ = 2196288.

The previous prime is 6405979. The next prime is 6405989. The reversal of 6405980 is 895046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6405989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22739 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (640612).

Almost surely, 2^6405980 is an apocalyptic number.

It is an amenable number.

6405980 is an abundant number, since it is smaller than the sum of its proper divisors (8968708).

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

6405980 is a wasteful number, since it uses less digits than its factorization.

6405980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45773 (or 45771 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6405980 is about 2531.0037534543. The cubic root of 6405980 is about 185.7213618042.

The spelling of 6405980 in words is "six million, four hundred five thousand, nine hundred eighty".