120721380 has 192 divisors, whose sum is σ = 386104320. Its totient is φ = 27979776.

The previous prime is 120721357. The next prime is 120721397. The reversal of 120721380 is 83127021.

It is a self number, because there is not a number n which added to its sum of digits gives 120721380.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1356376 + ... + 1356464.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^120721380 is an apocalyptic number.

120721380 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 120721380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193052160).

120721380 is an abundant number, since it is smaller than the sum of its proper divisors (265382940).

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

120721380 is a wasteful number, since it uses less digits than its factorization.

120721380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 120721380 is about 10987.3281556528. The cubic root of 120721380 is about 494.2288165065.

The spelling of 120721380 in words is "one hundred twenty million, seven hundred twenty-one thousand, three hundred eighty".