3696991 has 4 divisors (see below), whose sum is σ = 3711312. Its totient is φ = 3682672.

The previous prime is 3696989. The next prime is 3697009. The reversal of 3696991 is 1996963.

3696991 = T₁₈ + T₁₉ + ... + T₂₈₀.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1996963 = 43 ⋅46441.

It is a cyclic number.

It is not a de Polignac number, because 3696991 - 2¹ = 3696989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3696911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6766 + ... + 7291.

It is an arithmetic number, because the mean of its divisors is an integer number (927828).

Almost surely, 2^3696991 is an apocalyptic number.

3696991 is a deficient number, since it is larger than the sum of its proper divisors (14321).

3696991 is a wasteful number, since it uses less digits than its factorization.

3696991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14320.

The product of its digits is 78732, while the sum is 43.

The square root of 3696991 is about 1922.7560947765. The cubic root of 3696991 is about 154.6260984275.

The spelling of 3696991 in words is "three million, six hundred ninety-six thousand, nine hundred ninety-one".