121932778 has 32 divisors (see below), whose sum is σ = 207611712. Its totient is φ = 53222400.

The previous prime is 121932751. The next prime is 121932799. The reversal of 121932778 is 877239121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121932778.

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, 56650 + ... + 58762.

It is an arithmetic number, because the mean of its divisors is an integer number (6487866).

Almost surely, 2^121932778 is an apocalyptic number.

121932778 is a deficient number, since it is larger than the sum of its proper divisors (85678934).

121932778 is a wasteful number, since it uses less digits than its factorization.

121932778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its digits is 42336, while the sum is 40.

The square root of 121932778 is about 11042.3176009387. The cubic root of 121932778 is about 495.8764569387.

The spelling of 121932778 in words is "one hundred twenty-one million, nine hundred thirty-two thousand, seven hundred seventy-eight".