3678391 has 2 divisors, whose sum is σ = 3678392. Its totient is φ = 3678390.

The previous prime is 3678377. The next prime is 3678407. The reversal of 3678391 is 1938763.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3678391 - 2¹⁵ = 3645623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3678391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3678791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1839195 + 1839196.

It is an arithmetic number, because the mean of its divisors is an integer number (1839196).

Almost surely, 2^3678391 is an apocalyptic number.

3678391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3678391 is an equidigital number, since it uses as much as digits as its factorization.

3678391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 3678391 is about 1917.9131888592. The cubic root of 3678391 is about 154.3663482506.

The spelling of 3678391 in words is "three million, six hundred seventy-eight thousand, three hundred ninety-one".