3691636949 has 32 divisors (see below), whose sum is σ = 5062127616. Its totient is φ = 2598793920.

The previous prime is 3691636933. The next prime is 3691636957. The reversal of 3691636949 is 9496361963.

It is a happy number.

3691636949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3691636949 - 2⁴ = 3691636933 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3691636894 and 3691636903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691636999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7814 + ... + 86280.

It is an arithmetic number, because the mean of its divisors is an integer number (158191488).

Almost surely, 2^3691636949 is an apocalyptic number.

It is an amenable number.

3691636949 is a deficient number, since it is larger than the sum of its proper divisors (1370490667).

3691636949 is a wasteful number, since it uses less digits than its factorization.

3691636949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78545.

The product of its digits is 5668704, while the sum is 56.

The square root of 3691636949 is about 60758.8425581001. The cubic root of 3691636949 is about 1545.5141823604.

The spelling of 3691636949 in words is "three billion, six hundred ninety-one million, six hundred thirty-six thousand, nine hundred forty-nine".