121563440 has 40 divisors (see below), whose sum is σ = 283100928. Its totient is φ = 48545280.

The previous prime is 121563439. The next prime is 121563443. The reversal of 121563440 is 44365121.

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

It is not an unprimeable number, because it can be changed into a prime (121563443) 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, 81905 + ... + 83375.

Almost surely, 2^121563440 is an apocalyptic number.

121563440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121563440 is an abundant number, since it is smaller than the sum of its proper divisors (161537488).

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

121563440 is a wasteful number, since it uses less digits than its factorization.

121563440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517 (or 2511 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 121563440 is about 11025.5811638208. The cubic root of 121563440 is about 495.3752757362.

The spelling of 121563440 in words is "one hundred twenty-one million, five hundred sixty-three thousand, four hundred forty".