121157808 has 80 divisors (see below), whose sum is σ = 322407936. Its totient is φ = 39191040.

The previous prime is 121157791. The next prime is 121157819. The reversal of 121157808 is 808751121.

It is a super-3 number, since 3×121157808³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248541 + ... + 249027.

Almost surely, 2^121157808 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 121157808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161203968).

121157808 is an abundant number, since it is smaller than the sum of its proper divisors (201250128).

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

121157808 is a wasteful number, since it uses less digits than its factorization.

121157808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 33.

The square root of 121157808 is about 11007.1707536496. The cubic root of 121157808 is about 494.8236735508.

The spelling of 121157808 in words is "one hundred twenty-one million, one hundred fifty-seven thousand, eight hundred eight".