121306840 has 32 divisors (see below), whose sum is σ = 274104000. Its totient is φ = 48315904.

The previous prime is 121306819. The next prime is 121306847. The reversal of 121306840 is 48603121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121306847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3216 + ... + 15904.

It is an arithmetic number, because the mean of its divisors is an integer number (8565750).

Almost surely, 2^121306840 is an apocalyptic number.

121306840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121306840 is an abundant number, since it is smaller than the sum of its proper divisors (152797160).

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

121306840 is a wasteful number, since it uses less digits than its factorization.

121306840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12939 (or 12935 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 121306840 is about 11013.9384418109. The cubic root of 121306840 is about 495.0264788747.

Adding to 121306840 its reverse (48603121), we get a palindrome (169909961).

The spelling of 121306840 in words is "one hundred twenty-one million, three hundred six thousand, eight hundred forty".