3678991 has 4 divisors (see below), whose sum is σ = 3683232. Its totient is φ = 3674752.

The previous prime is 3678979. The next prime is 3679003. The reversal of 3678991 is 1998763.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (3678979) and next prime (3679003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3678991 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 (3678931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295 + ... + 2728.

It is an arithmetic number, because the mean of its divisors is an integer number (920808).

Almost surely, 2^3678991 is an apocalyptic number.

3678991 is a deficient number, since it is larger than the sum of its proper divisors (4241).

3678991 is a wasteful number, since it uses less digits than its factorization.

3678991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240.

The product of its digits is 81648, while the sum is 43.

The square root of 3678991 is about 1918.0696024910. The cubic root of 3678991 is about 154.3747409394.

The spelling of 3678991 in words is "three million, six hundred seventy-eight thousand, nine hundred ninety-one".