3668991 has 8 divisors (see below), whose sum is σ = 5179824. Its totient is φ = 2302080.

The previous prime is 3668989. The next prime is 3668999. The reversal of 3668991 is 1998663.

3668991 = T₁₃₈ + T₁₃₉ + ... + T₂₉₀.

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

It is not a de Polignac number, because 3668991 - 2¹ = 3668989 is a prime.

It is a super-2 number, since 2×3668991² = 26922989916162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3668999) 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, 35920 + ... + 36021.

It is an arithmetic number, because the mean of its divisors is an integer number (647478).

Almost surely, 2^3668991 is an apocalyptic number.

3668991 is a deficient number, since it is larger than the sum of its proper divisors (1510833).

3668991 is a wasteful number, since it uses less digits than its factorization.

3668991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71961.

The product of its digits is 69984, while the sum is 42.

The square root of 3668991 is about 1915.4610411073. The cubic root of 3668991 is about 154.2347434754.

The spelling of 3668991 in words is "three million, six hundred sixty-eight thousand, nine hundred ninety-one".