8601990 has 16 divisors (see below), whose sum is σ = 20644848. Its totient is φ = 2293856.

The previous prime is 8601979. The next prime is 8601991. The reversal of 8601990 is 991068.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8601991) 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, 143337 + ... + 143396.

It is an arithmetic number, because the mean of its divisors is an integer number (1290303).

Almost surely, 2^8601990 is an apocalyptic number.

8601990 is an abundant number, since it is smaller than the sum of its proper divisors (12042858).

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

8601990 is a wasteful number, since it uses less digits than its factorization.

8601990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286743.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 8601990 is about 2932.9149322815. The cubic root of 8601990 is about 204.8957629898.

It can be divided in two parts, 8601 and 990, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 8601990 in words is "eight million, six hundred one thousand, nine hundred ninety".