121723840 has 112 divisors (see below), whose sum is σ = 338328000. Its totient is φ = 41696256.

The previous prime is 121723837. The next prime is 121723867. The reversal of 121723840 is 48327121.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 121723799 and 121723808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109206 + ... + 110314.

Almost surely, 2^121723840 is an apocalyptic number.

121723840 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 121723840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169164000).

121723840 is an abundant number, since it is smaller than the sum of its proper divisors (216604160).

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

121723840 is an equidigital number, since it uses as much as digits as its factorization.

121723840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 121723840 is about 11032.8527589196. The cubic root of 121723840 is about 495.5930585173.

The spelling of 121723840 in words is "one hundred twenty-one million, seven hundred twenty-three thousand, eight hundred forty".