3599821 has 2 divisors, whose sum is σ = 3599822. Its totient is φ = 3599820.

The previous prime is 3599779. The next prime is 3599833. The reversal of 3599821 is 1289953.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 1653796 = 1395^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 3599821 - 2¹¹ = 3597773 is a prime.

It is a super-2 number, since 2×3599821² = 25917422464082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3599851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1799910 + 1799911.

It is an arithmetic number, because the mean of its divisors is an integer number (1799911).

Almost surely, 2^3599821 is an apocalyptic number.

It is an amenable number.

3599821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3599821 is an equidigital number, since it uses as much as digits as its factorization.

3599821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 3599821 is about 1897.3194248729. The cubic root of 3599821 is about 153.2593462627.

It can be divided in two parts, 35 and 99821, that added together give a square (99856 = 316²).

The spelling of 3599821 in words is "three million, five hundred ninety-nine thousand, eight hundred twenty-one".