121727978 has 8 divisors (see below), whose sum is σ = 183074880. Its totient is φ = 60703020.

The previous prime is 121727953. The next prime is 121727987. The reversal of 121727978 is 879727121.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79538 + ... + 81053.

It is an arithmetic number, because the mean of its divisors is an integer number (22884360).

Almost surely, 2^121727978 is an apocalyptic number.

121727978 is a deficient number, since it is larger than the sum of its proper divisors (61346902).

121727978 is a wasteful number, since it uses less digits than its factorization.

121727978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160972.

The product of its digits is 98784, while the sum is 44.

The square root of 121727978 is about 11033.0402881527. The cubic root of 121727978 is about 495.5986743463.

The spelling of 121727978 in words is "one hundred twenty-one million, seven hundred twenty-seven thousand, nine hundred seventy-eight".