8391090 has 32 divisors (see below), whose sum is σ = 21015936. Its totient is φ = 2140160.

The previous prime is 8391083. The next prime is 8391109. The reversal of 8391090 is 901938.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5391 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (656748).

Almost surely, 2^8391090 is an apocalyptic number.

8391090 is an abundant number, since it is smaller than the sum of its proper divisors (12624846).

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

8391090 is a wasteful number, since it uses less digits than its factorization.

8391090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12194.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 8391090 is about 2896.7378203766. The cubic root of 8391090 is about 203.2073721931.

The spelling of 8391090 in words is "eight million, three hundred ninety-one thousand, ninety".