405687366 has 120 divisors (see below), whose sum is σ = 1067655600. Its totient is φ = 115132752.

The previous prime is 405687361. The next prime is 405687367. The reversal of 405687366 is 663786504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405687361) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2722660 + ... + 2722808.

It is an arithmetic number, because the mean of its divisors is an integer number (8897130).

Almost surely, 2^405687366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405687366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533827800).

405687366 is an abundant number, since it is smaller than the sum of its proper divisors (661968234).

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

405687366 is an frugal number, since it uses more digits than its factorization.

405687366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 405687366 is about 20141.6823031245. The cubic root of 405687366 is about 740.2819512390.

The spelling of 405687366 in words is "four hundred five million, six hundred eighty-seven thousand, three hundred sixty-six".