3221812378 has 4 divisors (see below), whose sum is σ = 4832718570. Its totient is φ = 1610906188.

The previous prime is 3221812339. The next prime is 3221812403. The reversal of 3221812378 is 8732181223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8732181223 = 17 ⋅513657719.

It can be written as a sum of positive squares in only one way, i.e., 3218633289 + 3179089 = 56733^2 + 1783^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805453093 + ... + 805453096.

Almost surely, 2^3221812378 is an apocalyptic number.

3221812378 is a deficient number, since it is larger than the sum of its proper divisors (1610906192).

3221812378 is a wasteful number, since it uses less digits than its factorization.

3221812378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610906191.

The product of its digits is 32256, while the sum is 37.

The square root of 3221812378 is about 56761.0110727425. The cubic root of 3221812378 is about 1476.9532491990.

The spelling of 3221812378 in words is "three billion, two hundred twenty-one million, eight hundred twelve thousand, three hundred seventy-eight".