172222427 has 32 divisors (see below), whose sum is σ = 204482880. Its totient is φ = 143585280.

The previous prime is 172222417. The next prime is 172222451. The reversal of 172222427 is 724222271.

It is not a de Polignac number, because 172222427 - 2¹² = 172218331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172222427.

It is not an unprimeable number, because it can be changed into a prime (172222417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 751949 + ... + 752177.

It is an arithmetic number, because the mean of its divisors is an integer number (6390090).

Almost surely, 2^172222427 is an apocalyptic number.

172222427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

172222427 is a deficient number, since it is larger than the sum of its proper divisors (32260453).

172222427 is a wasteful number, since it uses less digits than its factorization.

172222427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383.

The product of its digits is 6272, while the sum is 29.

The square root of 172222427 is about 13123.3542587252. The cubic root of 172222427 is about 556.3693987349.

Adding to 172222427 its reverse (724222271), we get a palindrome (896444698).

The spelling of 172222427 in words is "one hundred seventy-two million, two hundred twenty-two thousand, four hundred twenty-seven".