3643639 has 2 divisors, whose sum is σ = 3643640. Its totient is φ = 3643638.

The previous prime is 3643631. The next prime is 3643657. The reversal of 3643639 is 9363463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3643639 - 2³ = 3643631 is a prime.

It is a super-2 number, since 2×3643639² = 26552210324642, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3643631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821819 + 1821820.

It is an arithmetic number, because the mean of its divisors is an integer number (1821820).

Almost surely, 2^3643639 is an apocalyptic number.

3643639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643639 is an equidigital number, since it uses as much as digits as its factorization.

3643639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 34.

The square root of 3643639 is about 1908.8318417294. The cubic root of 3643639 is about 153.8786782710.

The spelling of 3643639 in words is "three million, six hundred forty-three thousand, six hundred thirty-nine".