3991836 has 24 divisors (see below), whose sum is σ = 9380224. Its totient is φ = 1321200.

The previous prime is 3991831. The next prime is 3991853. The reversal of 3991836 is 6381993.

It is a junction number, because it is equal to n+sod(n) for n = 3991794 and 3991803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991831) 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, 711 + ... + 2913.

Almost surely, 2^3991836 is an apocalyptic number.

It is an amenable number.

3991836 is an abundant number, since it is smaller than the sum of its proper divisors (5388388).

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

3991836 is a wasteful number, since it uses less digits than its factorization.

3991836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361 (or 2359 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 3991836 is about 1997.9579575156. The cubic root of 3991836 is about 158.6320354551.

The spelling of 3991836 in words is "three million, nine hundred ninety-one thousand, eight hundred thirty-six".