8405490 has 16 divisors (see below), whose sum is σ = 20173248. Its totient is φ = 2241456.

The previous prime is 8405489. The next prime is 8405491. The reversal of 8405490 is 945048.

It is an interprime number because it is at equal distance from previous prime (8405489) and next prime (8405491).

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 280183 = 8405490 / (8 + 4 + 0 + 5 + 4 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (8405491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140062 + ... + 140121.

It is an arithmetic number, because the mean of its divisors is an integer number (1260828).

Almost surely, 2^8405490 is an apocalyptic number.

8405490 is an abundant number, since it is smaller than the sum of its proper divisors (11767758).

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

8405490 is a wasteful number, since it uses less digits than its factorization.

8405490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280193.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 8405490 is about 2899.2223095168. Note that the first 3 decimals coincide. The cubic root of 8405490 is about 203.3235475597.

The spelling of 8405490 in words is "eight million, four hundred five thousand, four hundred ninety".