121772860 has 24 divisors (see below), whose sum is σ = 278971056. Its totient is φ = 44280960.

The previous prime is 121772839. The next prime is 121772863. The reversal of 121772860 is 68277121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121772863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276537 + ... + 276976.

It is an arithmetic number, because the mean of its divisors is an integer number (11623794).

Almost surely, 2^121772860 is an apocalyptic number.

121772860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121772860 is an abundant number, since it is smaller than the sum of its proper divisors (157198196).

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

121772860 is a wasteful number, since it uses less digits than its factorization.

121772860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553533 (or 553531 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 121772860 is about 11035.0740822162. The cubic root of 121772860 is about 495.6595771529.

The spelling of 121772860 in words is "one hundred twenty-one million, seven hundred seventy-two thousand, eight hundred sixty".