3999850 has 12 divisors (see below), whose sum is σ = 7439814. Its totient is φ = 1599920.

The previous prime is 3999803. The next prime is 3999851. The reversal of 3999850 is 589993.

It can be written as a sum of positive squares in 3 ways, for example, as 2064969 + 1934881 = 1437^2 + 1391^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3999797 and 3999806.

It is not an unprimeable number, because it can be changed into a prime (3999851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39949 + ... + 40048.

Almost surely, 2^3999850 is an apocalyptic number.

3999850 is a deficient number, since it is larger than the sum of its proper divisors (3439964).

3999850 is a wasteful number, since it uses less digits than its factorization.

3999850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80009 (or 80004 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 3999850 is about 1999.9624996484. The cubic root of 3999850 is about 158.7381209207.

The spelling of 3999850 in words is "three million, nine hundred ninety-nine thousand, eight hundred fifty".