121399684 has 48 divisors (see below), whose sum is σ = 256596480. Its totient is φ = 49150080.

The previous prime is 121399667. The next prime is 121399693. The reversal of 121399684 is 486993121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121399684.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 36574 + ... + 39754.

It is an arithmetic number, because the mean of its divisors is an integer number (5345760).

Almost surely, 2^121399684 is an apocalyptic number.

121399684 is a gapful number since it is divisible by the number (14) 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 121399684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128298240).

121399684 is an abundant number, since it is smaller than the sum of its proper divisors (135196796).

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

121399684 is a wasteful number, since it uses less digits than its factorization.

121399684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268 (or 3266 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 121399684 is about 11018.1524767086. The cubic root of 121399684 is about 495.1527386358.

The spelling of 121399684 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, six hundred eighty-four".