3653989 has 2 divisors, whose sum is σ = 3653990. Its totient is φ = 3653988.

The previous prime is 3653981. The next prime is 3653999. The reversal of 3653989 is 9893563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 24964 = 1905^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 3653989 - 2³ = 3653981 is a prime.

It is a super-2 number, since 2×3653989² = 26703271224242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3⁵ + 6⁸ + 5⁹ + 3⁹ + 9² + 8³ + 9³ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3653981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1826994 + 1826995.

It is an arithmetic number, because the mean of its divisors is an integer number (1826995).

Almost surely, 2^3653989 is an apocalyptic number.

It is an amenable number.

3653989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3653989 is an equidigital number, since it uses as much as digits as its factorization.

3653989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 43.

The square root of 3653989 is about 1911.5410013913. The cubic root of 3653989 is about 154.0242414192.

The spelling of 3653989 in words is "three million, six hundred fifty-three thousand, nine hundred eighty-nine".