121660340 has 48 divisors (see below), whose sum is σ = 270321408. Its totient is φ = 45897984.

The previous prime is 121660223. The next prime is 121660349. The reversal of 121660340 is 43066121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121660349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31769 + ... + 35391.

It is an arithmetic number, because the mean of its divisors is an integer number (5631696).

Almost surely, 2^121660340 is an apocalyptic number.

121660340 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 121660340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135160704).

121660340 is an abundant number, since it is smaller than the sum of its proper divisors (148661068).

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

121660340 is a wasteful number, since it uses less digits than its factorization.

121660340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728 (or 3726 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 121660340 is about 11029.9746146580. The cubic root of 121660340 is about 495.5068644100.

The spelling of 121660340 in words is "one hundred twenty-one million, six hundred sixty thousand, three hundred forty".