3896991 has 48 divisors (see below), whose sum is σ = 6988800. Its totient is φ = 2122848.

The previous prime is 3896987. The next prime is 3896993. The reversal of 3896991 is 1996983.

It is not a de Polignac number, because 3896991 - 2² = 3896987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3896993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49290 + ... + 49368.

It is an arithmetic number, because the mean of its divisors is an integer number (145600).

Almost surely, 2^3896991 is an apocalyptic number.

3896991 is a deficient number, since it is larger than the sum of its proper divisors (3091809).

3896991 is an equidigital number, since it uses as much as digits as its factorization.

3896991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 118 counting only the distinct ones).

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

The square root of 3896991 is about 1974.0797856216. The cubic root of 3896991 is about 157.3655996297.

It can be divided in two parts, 38969 and 91, that added together give a triangular number (39060 = T₂₇₉).

The spelling of 3896991 in words is "three million, eight hundred ninety-six thousand, nine hundred ninety-one".