3693991 has 16 divisors (see below), whose sum is σ = 4515840. Its totient is φ = 2953440.

The previous prime is 3693983. The next prime is 3693997. The reversal of 3693991 is 1993963.

It is not a de Polignac number, because 3693991 - 2³ = 3693983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3693997) 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 15 ways as a sum of consecutive naturals, for example, 6000 + ... + 6586.

It is an arithmetic number, because the mean of its divisors is an integer number (282240).

Almost surely, 2^3693991 is an apocalyptic number.

3693991 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3693991 is a deficient number, since it is larger than the sum of its proper divisors (821849).

3693991 is a wasteful number, since it uses less digits than its factorization.

3693991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654.

The product of its digits is 39366, while the sum is 40.

The square root of 3693991 is about 1921.9758062993. The cubic root of 3693991 is about 154.5842622580.

The spelling of 3693991 in words is "three million, six hundred ninety-three thousand, nine hundred ninety-one".