3639913 has 2 divisors, whose sum is σ = 3639914. Its totient is φ = 3639912.

The previous prime is 3639869. The next prime is 3639919. The reversal of 3639913 is 3199363.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3125824 + 514089 = 1768^2 + 717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3639913 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3639919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819956 + 1819957.

It is an arithmetic number, because the mean of its divisors is an integer number (1819957).

Almost surely, 2^3639913 is an apocalyptic number.

It is an amenable number.

3639913 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639913 is an equidigital number, since it uses as much as digits as its factorization.

3639913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 34.

The square root of 3639913 is about 1907.8556025025. The cubic root of 3639913 is about 153.8262080616.

The spelling of 3639913 in words is "three million, six hundred thirty-nine thousand, nine hundred thirteen".