121143840 has 48 divisors (see below), whose sum is σ = 381604608. Its totient is φ = 32304896.

The previous prime is 121143811. The next prime is 121143859. The reversal of 121143840 is 48341121.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×121143840³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121143840.

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, 125712 + ... + 126671.

It is an arithmetic number, because the mean of its divisors is an integer number (7950096).

Almost surely, 2^121143840 is an apocalyptic number.

121143840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121143840 is an abundant number, since it is smaller than the sum of its proper divisors (260460768).

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

121143840 is a wasteful number, since it uses less digits than its factorization.

121143840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252401 (or 252393 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 121143840 is about 11006.5362398895. The cubic root of 121143840 is about 494.8046571324.

Adding to 121143840 its reverse (48341121), we get a palindrome (169484961).

The spelling of 121143840 in words is "one hundred twenty-one million, one hundred forty-three thousand, eight hundred forty".