3221618 has 4 divisors (see below), whose sum is σ = 4832430. Its totient is φ = 1610808.

The previous prime is 3221599. The next prime is 3221629. The reversal of 3221618 is 8161223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8161223 = 7 ⋅1165889.

It can be written as a sum of positive squares in only one way, i.e., 2948089 + 273529 = 1717^2 + 523^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3221593 and 3221602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805403 + ... + 805406.

Almost surely, 2^3221618 is an apocalyptic number.

3221618 is a deficient number, since it is larger than the sum of its proper divisors (1610812).

3221618 is a wasteful number, since it uses less digits than its factorization.

3221618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610811.

The product of its digits is 576, while the sum is 23.

The square root of 3221618 is about 1794.8866259461. The cubic root of 3221618 is about 147.6923546146.

The spelling of 3221618 in words is "three million, two hundred twenty-one thousand, six hundred eighteen".