140821920 has 144 divisors (see below), whose sum is σ = 505945440. Its totient is φ = 35569152.

The previous prime is 140821903. The next prime is 140821927. The reversal of 140821920 is 29128041.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (140821927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24787 + ... + 29933.

It is an arithmetic number, because the mean of its divisors is an integer number (3513510).

Almost surely, 2^140821920 is an apocalyptic number.

140821920 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 140821920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252972720).

140821920 is an abundant number, since it is smaller than the sum of its proper divisors (365123520).

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

140821920 is a wasteful number, since it uses less digits than its factorization.

140821920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187 (or 5176 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 140821920 is about 11866.8411972184. The cubic root of 140821920 is about 520.2635744652.

Adding to 140821920 its reverse (29128041), we get a palindrome (169949961).

The spelling of 140821920 in words is "one hundred forty million, eight hundred twenty-one thousand, nine hundred twenty".