405774990 has 24 divisors (see below), whose sum is σ = 1055015208. Its totient is φ = 108206640.

The previous prime is 405774979. The next prime is 405774997. The reversal of 405774990 is 99477504.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405774997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2254216 + ... + 2254395.

It is an arithmetic number, because the mean of its divisors is an integer number (43958967).

Almost surely, 2^405774990 is an apocalyptic number.

405774990 is an abundant number, since it is smaller than the sum of its proper divisors (649240218).

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

405774990 is a wasteful number, since it uses less digits than its factorization.

405774990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508624 (or 4508621 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 405774990 is about 20143.8573763815. The cubic root of 405774990 is about 740.3352449831.

The spelling of 405774990 in words is "four hundred five million, seven hundred seventy-four thousand, nine hundred ninety".