3646399 has 2 divisors, whose sum is σ = 3646400. Its totient is φ = 3646398.

The previous prime is 3646393. The next prime is 3646411. The reversal of 3646399 is 9936463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3646399 - 2¹¹ = 3644351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3646393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1823199 + 1823200.

It is an arithmetic number, because the mean of its divisors is an integer number (1823200).

Almost surely, 2^3646399 is an apocalyptic number.

3646399 is a deficient number, since it is larger than the sum of its proper divisors (1).

3646399 is an equidigital number, since it uses as much as digits as its factorization.

3646399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 40.

The square root of 3646399 is about 1909.5546601237. The cubic root of 3646399 is about 153.9175220351.

Subtracting 3646399 from its reverse (9936463), we obtain a square (6290064 = 2508²).

The spelling of 3646399 in words is "three million, six hundred forty-six thousand, three hundred ninety-nine".