121943905 has 8 divisors (see below), whose sum is σ = 146568384. Its totient is φ = 97398000.

The previous prime is 121943903. The next prime is 121943911. The reversal of 121943905 is 509349121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121943905 - 2¹ = 121943903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121943903) 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, 16171 + ... + 22480.

It is an arithmetic number, because the mean of its divisors is an integer number (18321048).

Almost surely, 2^121943905 is an apocalyptic number.

It is an amenable number.

121943905 is a deficient number, since it is larger than the sum of its proper divisors (24624479).

121943905 is an equidigital number, since it uses as much as digits as its factorization.

121943905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39287.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 121943905 is about 11042.8214238934. The cubic root of 121943905 is about 495.8915402483.

The spelling of 121943905 in words is "one hundred twenty-one million, nine hundred forty-three thousand, nine hundred five".