121778982 has 24 divisors (see below), whose sum is σ = 284151504. Its totient is φ = 37470384.

The previous prime is 121778971. The next prime is 121778983. The reversal of 121778982 is 289877121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121778983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259978 + ... + 260445.

It is an arithmetic number, because the mean of its divisors is an integer number (11839646).

Almost surely, 2^121778982 is an apocalyptic number.

121778982 is an abundant number, since it is smaller than the sum of its proper divisors (162372522).

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

121778982 is a wasteful number, since it uses less digits than its factorization.

121778982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520444 (or 520441 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 121778982 is about 11035.3514669901. The cubic root of 121778982 is about 495.6678832650.

It can be divided in two parts, 121778 and 982, that added together give a triangular number (122760 = T₄₉₅).

The spelling of 121778982 in words is "one hundred twenty-one million, seven hundred seventy-eight thousand, nine hundred eighty-two".