121575440 has 80 divisors (see below), whose sum is σ = 328431360. Its totient is φ = 40988160.

The previous prime is 121575427. The next prime is 121575463. The reversal of 121575440 is 44575121.

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

It is a super-2 number, since 2×121575440² = 29561175222387200, which contains 22 as substring.

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, 32381 + ... + 35939.

It is an arithmetic number, because the mean of its divisors is an integer number (4105392).

Almost surely, 2^121575440 is an apocalyptic number.

121575440 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 121575440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164215680).

121575440 is an abundant number, since it is smaller than the sum of its proper divisors (206855920).

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

121575440 is a wasteful number, since it uses less digits than its factorization.

121575440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640 (or 3634 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 121575440 is about 11026.1253393928. The cubic root of 121575440 is about 495.3915753400.

The spelling of 121575440 in words is "one hundred twenty-one million, five hundred seventy-five thousand, four hundred forty".