8215990 has 32 divisors (see below), whose sum is σ = 15694560. Its totient is φ = 3091200.

The previous prime is 8215973. The next prime is 8215993. The reversal of 8215990 is 995128.

8215990 = 195² + 196² + ... + 317².

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8215993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11545 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (490455).

Almost surely, 2^8215990 is an apocalyptic number.

8215990 is a deficient number, since it is larger than the sum of its proper divisors (7478570).

8215990 is a wasteful number, since it uses less digits than its factorization.

8215990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 8215990 is about 2866.3548280002. The cubic root of 8215990 is about 201.7839568445.

The spelling of 8215990 in words is "eight million, two hundred fifteen thousand, nine hundred ninety".