121890500 has 24 divisors (see below), whose sum is σ = 266209944. Its totient is φ = 48756000.

The previous prime is 121890473. The next prime is 121890511. The reversal of 121890500 is 5098121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3211264 + 118679236 = 1792^2 + 10894^2 .

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 121890500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121391 + ... + 122390.

It is an arithmetic number, because the mean of its divisors is an integer number (11092081).

Almost surely, 2^121890500 is an apocalyptic number.

121890500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121890500 is an abundant number, since it is smaller than the sum of its proper divisors (144319444).

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

121890500 is a wasteful number, since it uses less digits than its factorization.

121890500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243800 (or 243788 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 121890500 is about 11040.4030723520. The cubic root of 121890500 is about 495.8191382295.

The spelling of 121890500 in words is "one hundred twenty-one million, eight hundred ninety thousand, five hundred".