3643889 has 4 divisors (see below), whose sum is σ = 3662400. Its totient is φ = 3625380.

The previous prime is 3643883. The next prime is 3643891. The reversal of 3643889 is 9883463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3643889 - 2⁴ = 3643873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643883) 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, 8957 + ... + 9354.

It is an arithmetic number, because the mean of its divisors is an integer number (915600).

Almost surely, 2^3643889 is an apocalyptic number.

It is an amenable number.

3643889 is a deficient number, since it is larger than the sum of its proper divisors (18511).

3643889 is a wasteful number, since it uses less digits than its factorization.

3643889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18510.

The product of its digits is 124416, while the sum is 41.

The square root of 3643889 is about 1908.8973256831. The cubic root of 3643889 is about 153.8821975357.

The spelling of 3643889 in words is "three million, six hundred forty-three thousand, eight hundred eighty-nine".