3991698 has 24 divisors (see below), whose sum is σ = 8697936. Its totient is φ = 1323000.

The previous prime is 3991693. The next prime is 3991703. The reversal of 3991698 is 8961993.

3991698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3991693) and next prime (3991703).

It is not an unprimeable number, because it can be changed into a prime (3991693) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3273 + ... + 4323.

It is an arithmetic number, because the mean of its divisors is an integer number (362414).

Almost surely, 2^3991698 is an apocalyptic number.

3991698 is an abundant number, since it is smaller than the sum of its proper divisors (4706238).

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

3991698 is a wasteful number, since it uses less digits than its factorization.

3991698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1267 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 3991698 is about 1997.9234219559. The cubic root of 3991698 is about 158.6302074347.

The spelling of 3991698 in words is "three million, nine hundred ninety-one thousand, six hundred ninety-eight".