121899280 has 40 divisors (see below), whose sum is σ = 285321024. Its totient is φ = 48432000.

The previous prime is 121899229. The next prime is 121899293. The reversal of 121899280 is 82998121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 7035 + ... + 17125.

Almost surely, 2^121899280 is an apocalyptic number.

121899280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121899280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142660512).

121899280 is an abundant number, since it is smaller than the sum of its proper divisors (163421744).

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

121899280 is a wasteful number, since it uses less digits than its factorization.

121899280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255 (or 10249 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 121899280 is about 11040.8006956017. The cubic root of 121899280 is about 495.8310428693.

The spelling of 121899280 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, two hundred eighty".