3639213 has 6 divisors (see below), whose sum is σ = 5256654. Its totient is φ = 2426136.

The previous prime is 3639211. The next prime is 3639217. The reversal of 3639213 is 3129363.

3639213 is a `hidden beast` number, since 3 + 639 + 21 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3617604 + 21609 = 1902^2 + 147^2 .

It is not a de Polignac number, because 3639213 - 2¹ = 3639211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202170 + ... + 202187.

It is an arithmetic number, because the mean of its divisors is an integer number (876109).

Almost surely, 2^3639213 is an apocalyptic number.

It is an amenable number.

3639213 is a deficient number, since it is larger than the sum of its proper divisors (1617441).

3639213 is a wasteful number, since it uses less digits than its factorization.

3639213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404363 (or 404360 counting only the distinct ones).

The product of its digits is 2916, while the sum is 27.

The square root of 3639213 is about 1907.6721416428. The cubic root of 3639213 is about 153.8163465394.

The spelling of 3639213 in words is "three million, six hundred thirty-nine thousand, two hundred thirteen".