3691637 has 4 divisors (see below), whose sum is σ = 3698400. Its totient is φ = 3684876.

The previous prime is 3691627. The next prime is 3691657. The reversal of 3691637 is 7361963.

3691637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7361963 = 7 ⋅1051709.

It is a cyclic number.

It is not a de Polignac number, because 3691637 - 2⁴ = 3691621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3691597 and 3691606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691627) 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 3 ways as a sum of consecutive naturals, for example, 2483 + ... + 3680.

It is an arithmetic number, because the mean of its divisors is an integer number (924600).

Almost surely, 2^3691637 is an apocalyptic number.

It is an amenable number.

3691637 is a deficient number, since it is larger than the sum of its proper divisors (6763).

3691637 is an equidigital number, since it uses as much as digits as its factorization.

3691637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762.

The product of its digits is 20412, while the sum is 35.

The square root of 3691637 is about 1921.3633180635. The cubic root of 3691637 is about 154.5514189478.

The spelling of 3691637 in words is "three million, six hundred ninety-one thousand, six hundred thirty-seven".