3634639 has 2 divisors, whose sum is σ = 3634640. Its totient is φ = 3634638.

The previous prime is 3634637. The next prime is 3634663. The reversal of 3634639 is 9364363.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3634639 - 2¹ = 3634637 is a prime.

Together with 3634637, it forms a pair of twin primes.

3634639 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3634637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1817319 + 1817320.

It is an arithmetic number, because the mean of its divisors is an integer number (1817320).

Almost surely, 2^3634639 is an apocalyptic number.

3634639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3634639 is an equidigital number, since it uses as much as digits as its factorization.

3634639 is an evil number, because the sum of its binary digits is even.

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

The square root of 3634639 is about 1906.4729213918. The cubic root of 3634639 is about 153.7518773869.

The spelling of 3634639 in words is "three million, six hundred thirty-four thousand, six hundred thirty-nine".