3685891 has 4 divisors (see below), whose sum is σ = 4020984. Its totient is φ = 3350800.

The previous prime is 3685883. The next prime is 3685949. The reversal of 3685891 is 1985863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1985863 = 11 ⋅180533.

It is a cyclic number.

It is not a de Polignac number, because 3685891 - 2³ = 3685883 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (3685811) 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, 167530 + ... + 167551.

It is an arithmetic number, because the mean of its divisors is an integer number (1005246).

Almost surely, 2^3685891 is an apocalyptic number.

3685891 is a deficient number, since it is larger than the sum of its proper divisors (335093).

3685891 is a wasteful number, since it uses less digits than its factorization.

3685891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335092.

The product of its digits is 51840, while the sum is 40.

The square root of 3685891 is about 1919.8674433408. The cubic root of 3685891 is about 154.4711913413.

The spelling of 3685891 in words is "three million, six hundred eighty-five thousand, eight hundred ninety-one".