405640022 has 12 divisors (see below), whose sum is σ = 628723908. Its totient is φ = 196276500.

The previous prime is 405640003. The next prime is 405640051. The reversal of 405640022 is 220046504.

It is a self number, because there is not a number n which added to its sum of digits gives 405640022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103604 + ... + 107447.

It is an arithmetic number, because the mean of its divisors is an integer number (52393659).

Almost surely, 2^405640022 is an apocalyptic number.

405640022 is a deficient number, since it is larger than the sum of its proper divisors (223083886).

405640022 is a wasteful number, since it uses less digits than its factorization.

405640022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211115 (or 211084 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 405640022 is about 20140.5069946116. The cubic root of 405640022 is about 740.2531529778.

Adding to 405640022 its reverse (220046504), we get a palindrome (625686526).

The spelling of 405640022 in words is "four hundred five million, six hundred forty thousand, twenty-two".