122918990 has 8 divisors (see below), whose sum is σ = 221254200. Its totient is φ = 49167592.

The previous prime is 122918981. The next prime is 122919011. The reversal of 122918990 is 99819221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×122918990⁴ (a number of 33 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6145940 + ... + 6145959.

It is an arithmetic number, because the mean of its divisors is an integer number (27656775).

Almost surely, 2^122918990 is an apocalyptic number.

122918990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

122918990 is a deficient number, since it is larger than the sum of its proper divisors (98335210).

122918990 is a wasteful number, since it uses less digits than its factorization.

122918990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12291906.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 122918990 is about 11086.8836920029. The cubic root of 122918990 is about 497.2097782894.

The spelling of 122918990 in words is "one hundred twenty-two million, nine hundred eighteen thousand, nine hundred ninety".