121818840 has 256 divisors, whose sum is σ = 445132800. Its totient is φ = 26265600.

The previous prime is 121818817. The next prime is 121818847. The reversal of 121818840 is 48818121.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121818847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 531846 + ... + 532074.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^121818840 is an apocalyptic number.

121818840 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 121818840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222566400).

121818840 is an abundant number, since it is smaller than the sum of its proper divisors (323313960).

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

121818840 is a wasteful number, since it uses less digits than its factorization.

121818840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 33.

The square root of 121818840 is about 11037.1572426961. The cubic root of 121818840 is about 495.7219543785.

The spelling of 121818840 in words is "one hundred twenty-one million, eight hundred eighteen thousand, eight hundred forty".