122742418 has 4 divisors (see below), whose sum is σ = 184113630. Its totient is φ = 61371208.

The previous prime is 122742407. The next prime is 122742437. The reversal of 122742418 is 814247221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 814247221 = 673 ⋅1209877.

It can be written as a sum of positive squares in only one way, i.e., 92679129 + 30063289 = 9627^2 + 5483^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 122742418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30685603 + ... + 30685606.

Almost surely, 2^122742418 is an apocalyptic number.

122742418 is a deficient number, since it is larger than the sum of its proper divisors (61371212).

122742418 is an equidigital number, since it uses as much as digits as its factorization.

122742418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61371211.

The product of its digits is 7168, while the sum is 31.

The square root of 122742418 is about 11078.9177269262. The cubic root of 122742418 is about 496.9715851058.

Adding to 122742418 its reverse (814247221), we get a palindrome (936989639).

The spelling of 122742418 in words is "one hundred twenty-two million, seven hundred forty-two thousand, four hundred eighteen".