3639997 has 2 divisors, whose sum is σ = 3639998. Its totient is φ = 3639996.

The previous prime is 3639991. The next prime is 3640019. The reversal of 3639997 is 7999363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2149156 + 1490841 = 1466^2 + 1221^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639997 - 2⁷ = 3639869 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3639991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819998 + 1819999.

It is an arithmetic number, because the mean of its divisors is an integer number (1819999).

Almost surely, 2^3639997 is an apocalyptic number.

It is an amenable number.

3639997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639997 is an equidigital number, since it uses as much as digits as its factorization.

3639997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 46.

The square root of 3639997 is about 1907.8776166201. The cubic root of 3639997 is about 153.8273913593.

It can be divided in two parts, 3 and 639997, that added together give a square (640000 = 800²).

The spelling of 3639997 in words is "three million, six hundred thirty-nine thousand, nine hundred ninety-seven".