8406990 has 80 divisors (see below), whose sum is σ = 23051952. Its totient is φ = 2198016.

The previous prime is 8406977. The next prime is 8406991. The reversal of 8406990 is 996048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8406991) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78517 + ... + 78623.

Almost surely, 2^8406990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8406990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11525976).

8406990 is an abundant number, since it is smaller than the sum of its proper divisors (14644962).

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

8406990 is a wasteful number, since it uses less digits than its factorization.

8406990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 8406990 is about 2899.4809880391. The cubic root of 8406990 is about 203.3356415277.

The spelling of 8406990 in words is "eight million, four hundred six thousand, nine hundred ninety".