121455540 has 72 divisors (see below), whose sum is σ = 372048768. Its totient is φ = 32068800.

The previous prime is 121455527. The next prime is 121455547. The reversal of 121455540 is 45554121.

121455540 = T₄₁₃ + T₄₁₄ + ... + T₉₂₇.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121455547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15265 + ... + 21815.

It is an arithmetic number, because the mean of its divisors is an integer number (5167344).

Almost surely, 2^121455540 is an apocalyptic number.

121455540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121455540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186024384).

121455540 is an abundant number, since it is smaller than the sum of its proper divisors (250593228).

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

121455540 is a wasteful number, since it uses less digits than its factorization.

121455540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6669 (or 6664 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 121455540 is about 11020.6869114407. The cubic root of 121455540 is about 495.2286669245.

The spelling of 121455540 in words is "one hundred twenty-one million, four hundred fifty-five thousand, five hundred forty".