122400778 has 4 divisors (see below), whose sum is σ = 183601170. Its totient is φ = 61200388.

The previous prime is 122400763. The next prime is 122400791. The reversal of 122400778 is 877004221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877004221 = 43 ⋅20395447.

It can be written as a sum of positive squares in only one way, i.e., 121947849 + 452929 = 11043^2 + 673^2 .

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30600193 + ... + 30600196.

Almost surely, 2^122400778 is an apocalyptic number.

122400778 is a deficient number, since it is larger than the sum of its proper divisors (61200392).

122400778 is an equidigital number, since it uses as much as digits as its factorization.

122400778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61200391.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 122400778 is about 11063.4885095073. The cubic root of 122400778 is about 496.5100680920.

Adding to 122400778 its reverse (877004221), we get a palindrome (999404999).

The spelling of 122400778 in words is "one hundred twenty-two million, four hundred thousand, seven hundred seventy-eight".