121309940 has 24 divisors (see below), whose sum is σ = 258243720. Its totient is φ = 47858688.

The previous prime is 121309919. The next prime is 121309949. The reversal of 121309940 is 49903121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45796 + 121264144 = 214^2 + 11012^2 .

It is a super-2 number, since 2×121309940² = 29432203085607200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121309949) 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, 40085 + ... + 43004.

It is an arithmetic number, because the mean of its divisors is an integer number (10760155).

Almost surely, 2^121309940 is an apocalyptic number.

121309940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121309940 is an abundant number, since it is smaller than the sum of its proper divisors (136933780).

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

121309940 is a wasteful number, since it uses less digits than its factorization.

121309940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83171 (or 83169 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 121309940 is about 11014.0791716784. The cubic root of 121309940 is about 495.0306956443.

The spelling of 121309940 in words is "one hundred twenty-one million, three hundred nine thousand, nine hundred forty".