121266640 has 40 divisors (see below), whose sum is σ = 307578528. Its totient is φ = 44096640.

The previous prime is 121266623. The next prime is 121266641. The reversal of 121266640 is 46662121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 121266599 and 121266608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121266641) 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, 68022 + ... + 69781.

Almost surely, 2^121266640 is an apocalyptic number.

121266640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121266640 is an abundant number, since it is smaller than the sum of its proper divisors (186311888).

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

121266640 is a wasteful number, since it uses less digits than its factorization.

121266640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137827 (or 137821 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 121266640 is about 11012.1133303286. The cubic root of 121266640 is about 494.9717903864.

The spelling of 121266640 in words is "one hundred twenty-one million, two hundred sixty-six thousand, six hundred forty".