405409860 has 60 divisors (see below), whose sum is σ = 1271790828. Its totient is φ = 108108864.

The previous prime is 405409841. The next prime is 405409867. The reversal of 405409860 is 68904504.

It can be written as a sum of positive squares in 2 ways, for example, as 63011844 + 342398016 = 7938^2 + 18504^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (405409867) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 123507 + ... + 126746.

Almost surely, 2^405409860 is an apocalyptic number.

It is an amenable number.

405409860 is an abundant number, since it is smaller than the sum of its proper divisors (866380968).

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

405409860 is a wasteful number, since it uses less digits than its factorization.

405409860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250274 (or 250263 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 405409860 is about 20134.7922760579. The cubic root of 405409860 is about 740.1131188165.

The spelling of 405409860 in words is "four hundred five million, four hundred nine thousand, eight hundred sixty".