3691731 has 8 divisors (see below), whose sum is σ = 4942080. Its totient is φ = 2451272.

The previous prime is 3691717. The next prime is 3691747. The reversal of 3691731 is 1371963.

3691731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3691731 - 2⁷ = 3691603 is a prime.

It is a super-2 number, since 2×3691731² = 27257755552722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3691031) 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 7 ways as a sum of consecutive naturals, for example, 1551 + ... + 3128.

It is an arithmetic number, because the mean of its divisors is an integer number (617760).

Almost surely, 2^3691731 is an apocalyptic number.

3691731 is a deficient number, since it is larger than the sum of its proper divisors (1250349).

3691731 is a wasteful number, since it uses less digits than its factorization.

3691731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4945.

The product of its digits is 3402, while the sum is 30.

The square root of 3691731 is about 1921.3877797051. The cubic root of 3691731 is about 154.5527307154.

The spelling of 3691731 in words is "three million, six hundred ninety-one thousand, seven hundred thirty-one".