121772840 has 48 divisors (see below), whose sum is σ = 318726900. Its totient is φ = 41750016.

The previous prime is 121772839. The next prime is 121772863. The reversal of 121772840 is 48277121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 115906756 + 5866084 = 10766^2 + 2422^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121772797 and 121772806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29105 + ... + 33024.

Almost surely, 2^121772840 is an apocalyptic number.

121772840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121772840 is an abundant number, since it is smaller than the sum of its proper divisors (196954060).

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

121772840 is a wasteful number, since it uses less digits than its factorization.

121772840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62154 (or 62143 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 121772840 is about 11035.0731760147. The cubic root of 121772840 is about 495.6595500171.

The spelling of 121772840 in words is "one hundred twenty-one million, seven hundred seventy-two thousand, eight hundred forty".