3667991 has 8 divisors (see below), whose sum is σ = 3761664. Its totient is φ = 3575520.

The previous prime is 3667987. The next prime is 3667997. The reversal of 3667991 is 1997663.

It is a happy number.

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 3667991 - 2² = 3667987 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 (3667997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9386 + ... + 9768.

It is an arithmetic number, because the mean of its divisors is an integer number (470208).

Almost surely, 2^3667991 is an apocalyptic number.

3667991 is a deficient number, since it is larger than the sum of its proper divisors (93673).

3667991 is a wasteful number, since it uses less digits than its factorization.

3667991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 61236, while the sum is 41.

The square root of 3667991 is about 1915.1999895572. The cubic root of 3667991 is about 154.2207297444.

The spelling of 3667991 in words is "three million, six hundred sixty-seven thousand, nine hundred ninety-one".