405312140 has 24 divisors (see below), whose sum is σ = 858968880. Its totient is φ = 160636608.

The previous prime is 405312139. The next prime is 405312179. The reversal of 405312140 is 41213504.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90782 + ... + 95141.

It is an arithmetic number, because the mean of its divisors is an integer number (35790370).

Almost surely, 2^405312140 is an apocalyptic number.

It is an amenable number.

405312140 is an abundant number, since it is smaller than the sum of its proper divisors (453656740).

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

405312140 is a wasteful number, since it uses less digits than its factorization.

405312140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186041 (or 186039 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 405312140 is about 20132.3654844631. The cubic root of 405312140 is about 740.0536484115.

Adding to 405312140 its reverse (41213504), we get a palindrome (446525644).

The spelling of 405312140 in words is "four hundred five million, three hundred twelve thousand, one hundred forty".