3696221 has 4 divisors (see below), whose sum is σ = 3774912. Its totient is φ = 3617532.

The previous prime is 3696197. The next prime is 3696227. The reversal of 3696221 is 1226963.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1226963 = 19 ⋅64577.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3696221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3696227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39275 + ... + 39368.

It is an arithmetic number, because the mean of its divisors is an integer number (943728).

Almost surely, 2^3696221 is an apocalyptic number.

It is an amenable number.

3696221 is a deficient number, since it is larger than the sum of its proper divisors (78691).

3696221 is an equidigital number, since it uses as much as digits as its factorization.

3696221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78690.

The product of its digits is 3888, while the sum is 29.

The square root of 3696221 is about 1922.5558509443. Note that the first 3 decimals coincide. The cubic root of 3696221 is about 154.6153626370.

The spelling of 3696221 in words is "three million, six hundred ninety-six thousand, two hundred twenty-one".