3651889 has 4 divisors (see below), whose sum is σ = 3866724. Its totient is φ = 3437056.

The previous prime is 3651847. The next prime is 3651919. The reversal of 3651889 is 9881563.

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: 9881563 = 1447 ⋅6829.

It can be written as a sum of positive squares in 2 ways, for example, as 1520289 + 2131600 = 1233^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651889 - 2⁷ = 3651761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3651839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107392 + ... + 107425.

It is an arithmetic number, because the mean of its divisors is an integer number (966681).

Almost surely, 2^3651889 is an apocalyptic number.

It is an amenable number.

3651889 is a deficient number, since it is larger than the sum of its proper divisors (214835).

3651889 is a wasteful number, since it uses less digits than its factorization.

3651889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214834.

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

The square root of 3651889 is about 1910.9916274019. The cubic root of 3651889 is about 153.9947291163.

The spelling of 3651889 in words is "three million, six hundred fifty-one thousand, eight hundred eighty-nine".