122187817 has 8 divisors (see below), whose sum is σ = 126699840. Its totient is φ = 117695760.

The previous prime is 122187809. The next prime is 122187839. The reversal of 122187817 is 718781221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122187817 - 2³ = 122187809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122187847) 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 in 7 ways as a sum of consecutive naturals, for example, 8092 + ... + 17602.

It is an arithmetic number, because the mean of its divisors is an integer number (15837480).

Almost surely, 2^122187817 is an apocalyptic number.

It is an amenable number.

122187817 is a deficient number, since it is larger than the sum of its proper divisors (4512023).

122187817 is an equidigital number, since it uses as much as digits as its factorization.

122187817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983.

The product of its digits is 12544, while the sum is 37.

The square root of 122187817 is about 11053.8598236091. The cubic root of 122187817 is about 496.2219472031.

The spelling of 122187817 in words is "one hundred twenty-two million, one hundred eighty-seven thousand, eight hundred seventeen".