122139290 has 32 divisors (see below), whose sum is σ = 270587520. Its totient is φ = 38654784.

The previous prime is 122139289. The next prime is 122139313. The reversal of 122139290 is 92931221.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66200 + ... + 68019.

It is an arithmetic number, because the mean of its divisors is an integer number (8455860).

Almost surely, 2^122139290 is an apocalyptic number.

122139290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

122139290 is an abundant number, since it is smaller than the sum of its proper divisors (148448230).

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

122139290 is a wasteful number, since it uses less digits than its factorization.

122139290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134246.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 122139290 is about 11051.6645805055. The cubic root of 122139290 is about 496.1562468424.

The spelling of 122139290 in words is "one hundred twenty-two million, one hundred thirty-nine thousand, two hundred ninety".