122115978 has 16 divisors (see below), whose sum is σ = 271368960. Its totient is φ = 40705308.

The previous prime is 122115977. The next prime is 122115989. The reversal of 122115978 is 879511221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (122115977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130650 + ... + 1130757.

It is an arithmetic number, because the mean of its divisors is an integer number (16960560).

Almost surely, 2^122115978 is an apocalyptic number.

122115978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

122115978 is an abundant number, since it is smaller than the sum of its proper divisors (149252982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122115978 is a wasteful number, since it uses less digits than its factorization.

122115978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261418 (or 2261412 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 122115978 is about 11050.6098474247. The cubic root of 122115978 is about 496.1246787031.

The spelling of 122115978 in words is "one hundred twenty-two million, one hundred fifteen thousand, nine hundred seventy-eight".