3991650 has 96 divisors (see below), whose sum is σ = 11249280. Its totient is φ = 929280.

The previous prime is 3991649. The next prime is 3991667. The reversal of 3991650 is 561993.

3991650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44806 + ... + 44894.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

Almost surely, 2^3991650 is an apocalyptic number.

3991650 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5624640).

3991650 is an abundant number, since it is smaller than the sum of its proper divisors (7257630).

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

3991650 is a wasteful number, since it uses less digits than its factorization.

3991650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 3991650 is about 1997.9114094474. The cubic root of 3991650 is about 158.6295715916.

The spelling of 3991650 in words is "three million, nine hundred ninety-one thousand, six hundred fifty".