121943440 has 20 divisors (see below), whose sum is σ = 283518684. Its totient is φ = 48777344.

The previous prime is 121943359. The next prime is 121943443. The reversal of 121943440 is 44349121.

It can be written as a sum of positive squares in 2 ways, for example, as 34857216 + 87086224 = 5904^2 + 9332^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 121943399 and 121943408.

It is not an unprimeable number, because it can be changed into a prime (121943443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762067 + ... + 762226.

Almost surely, 2^121943440 is an apocalyptic number.

121943440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121943440 is an abundant number, since it is smaller than the sum of its proper divisors (161575244).

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

121943440 is a wasteful number, since it uses less digits than its factorization.

121943440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524306 (or 1524300 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 121943440 is about 11042.8003694715. The cubic root of 121943440 is about 495.8909099315.

The spelling of 121943440 in words is "one hundred twenty-one million, nine hundred forty-three thousand, four hundred forty".