121743945 has 32 divisors (see below), whose sum is σ = 225849600. Its totient is φ = 62105472.

The previous prime is 121743917. The next prime is 121743961. The reversal of 121743945 is 549347121.

121743945 is a `hidden beast` number, since 1 + 217 + 439 + 4 + 5 = 666.

It is not a de Polignac number, because 121743945 - 2⁸ = 121743689 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16500 + ... + 22709.

It is an arithmetic number, because the mean of its divisors is an integer number (7057800).

Almost surely, 2^121743945 is an apocalyptic number.

121743945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121743945 is a deficient number, since it is larger than the sum of its proper divisors (104105655).

121743945 is a wasteful number, since it uses less digits than its factorization.

121743945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39246 (or 39240 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 121743945 is about 11033.7638637049. The cubic root of 121743945 is about 495.6203425451.

The spelling of 121743945 in words is "one hundred twenty-one million, seven hundred forty-three thousand, nine hundred forty-five".