121997508 has 48 divisors (see below), whose sum is σ = 303295104. Its totient is φ = 38033920.

The previous prime is 121997507. The next prime is 121997531. The reversal of 121997508 is 805799121.

It is a self number, because there is not a number n which added to its sum of digits gives 121997508.

It is not an unprimeable number, because it can be changed into a prime (121997501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32278 + ... + 35858.

It is an arithmetic number, because the mean of its divisors is an integer number (6318648).

Almost surely, 2^121997508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121997508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151647552).

121997508 is an abundant number, since it is smaller than the sum of its proper divisors (181297596).

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

121997508 is a wasteful number, since it uses less digits than its factorization.

121997508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3772 (or 3770 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 121997508 is about 11045.2482090716. The cubic root of 121997508 is about 495.9641894455.

The spelling of 121997508 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, five hundred eight".