1720222402 has 4 divisors (see below), whose sum is σ = 2580333606. Its totient is φ = 860111200.

The previous prime is 1720222397. The next prime is 1720222403. The reversal of 1720222402 is 2042220271.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1407675361 + 312547041 = 37519^2 + 17679^2 .

It is a super-2 number, since 2×1720222402² = 5918330224685299208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1720222403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430055599 + ... + 430055602.

Almost surely, 2^1720222402 is an apocalyptic number.

1720222402 is a deficient number, since it is larger than the sum of its proper divisors (860111204).

1720222402 is an equidigital number, since it uses as much as digits as its factorization.

1720222402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860111203.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 1720222402 is about 41475.5639141893. The cubic root of 1720222402 is about 1198.1969222083.

Adding to 1720222402 its reverse (2042220271), we get a palindrome (3762442673).

The spelling of 1720222402 in words is "one billion, seven hundred twenty million, two hundred twenty-two thousand, four hundred two".