122117990 has 16 divisors (see below), whose sum is σ = 226903680. Its totient is φ = 47271360.

The previous prime is 122117981. The next prime is 122117999. The reversal of 122117990 is 99711221.

It is an interprime number because it is at equal distance from previous prime (122117981) and next prime (122117999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122117999) 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 in 7 ways as a sum of consecutive naturals, for example, 196655 + ... + 197274.

It is an arithmetic number, because the mean of its divisors is an integer number (14181480).

Almost surely, 2^122117990 is an apocalyptic number.

122117990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

122117990 is a deficient number, since it is larger than the sum of its proper divisors (104785690).

122117990 is a wasteful number, since it uses less digits than its factorization.

122117990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393967.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 122117990 is about 11050.7008827495. The cubic root of 122117990 is about 496.1274034280.

The spelling of 122117990 in words is "one hundred twenty-two million, one hundred seventeen thousand, nine hundred ninety".