122623978 has 4 divisors (see below), whose sum is σ = 183935970. Its totient is φ = 61311988.

The previous prime is 122623973. The next prime is 122623979. The reversal of 122623978 is 879326221.

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., 98545329 + 24078649 = 9927^2 + 4907^2 .

It is a Smith number, since the sum of its digits (40) 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 122623978.

It is not an unprimeable number, because it can be changed into a prime (122623973) 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 as a sum of consecutive naturals, namely, 30655993 + ... + 30655996.

Almost surely, 2^122623978 is an apocalyptic number.

122623978 is a deficient number, since it is larger than the sum of its proper divisors (61311992).

122623978 is an equidigital number, since it uses as much as digits as its factorization.

122623978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61311991.

The product of its digits is 72576, while the sum is 40.

The square root of 122623978 is about 11073.5711493628. The cubic root of 122623978 is about 496.8116831519.

It can be divided in two parts, 122 and 623978, that added together give a square (624100 = 790²).

The spelling of 122623978 in words is "one hundred twenty-two million, six hundred twenty-three thousand, nine hundred seventy-eight".