121451440 has 80 divisors (see below), whose sum is σ = 312122880. Its totient is φ = 43580160.

The previous prime is 121451437. The next prime is 121451453. The reversal of 121451440 is 44154121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68647 + ... + 70393.

It is an arithmetic number, because the mean of its divisors is an integer number (3901536).

Almost surely, 2^121451440 is an apocalyptic number.

121451440 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 121451440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156061440).

121451440 is an abundant number, since it is smaller than the sum of its proper divisors (190671440).

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

121451440 is a wasteful number, since it uses less digits than its factorization.

121451440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 1844 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 121451440 is about 11020.5008960573. The cubic root of 121451440 is about 495.2230943493.

The spelling of 121451440 in words is "one hundred twenty-one million, four hundred fifty-one thousand, four hundred forty".