121559440 has 40 divisors (see below), whose sum is σ = 286856640. Its totient is φ = 47895936.

The previous prime is 121559429. The next prime is 121559443. The reversal of 121559440 is 44955121.

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

It is a super-2 number, since 2×121559440² = 29553394906227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121559443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5980 + ... + 16699.

It is an arithmetic number, because the mean of its divisors is an integer number (7171416).

Almost surely, 2^121559440 is an apocalyptic number.

121559440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121559440 is an abundant number, since it is smaller than the sum of its proper divisors (165297200).

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

121559440 is a wasteful number, since it uses less digits than its factorization.

121559440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22759 (or 22753 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 121559440 is about 11025.3997659949. The cubic root of 121559440 is about 495.3698422966.

The spelling of 121559440 in words is "one hundred twenty-one million, five hundred fifty-nine thousand, four hundred forty".