122257998 has 40 divisors (see below), whose sum is σ = 279794592. Its totient is φ = 39883104.

The previous prime is 122257907. The next prime is 122258021. The reversal of 122257998 is 899752221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 415 + ... + 15642.

Almost surely, 2^122257998 is an apocalyptic number.

122257998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 122257998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139897296).

122257998 is an abundant number, since it is smaller than the sum of its proper divisors (157536594).

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

122257998 is a wasteful number, since it uses less digits than its factorization.

122257998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16118 (or 16109 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 122257998 is about 11057.0338698948. The cubic root of 122257998 is about 496.3169339972.

The spelling of 122257998 in words is "one hundred twenty-two million, two hundred fifty-seven thousand, nine hundred ninety-eight".