3991850 has 24 divisors (see below), whose sum is σ = 7683660. Its totient is φ = 1541120.

The previous prime is 3991831. The next prime is 3991853. The reversal of 3991850 is 581993.

It can be written as a sum of positive squares in 6 ways, for example, as 2505889 + 1485961 = 1583^2 + 1219^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 3991850.

It is not an unprimeable number, because it can be changed into a prime (3991853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74 + ... + 2826.

Almost surely, 2^3991850 is an apocalyptic number.

3991850 is a deficient number, since it is larger than the sum of its proper divisors (3691810).

3991850 is a wasteful number, since it uses less digits than its factorization.

3991850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794 (or 2789 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 3991850 is about 1997.9614610898. The cubic root of 3991850 is about 158.6322209041.

The spelling of 3991850 in words is "three million, nine hundred ninety-one thousand, eight hundred fifty".