140721540 has 48 divisors (see below), whose sum is σ = 395489472. Its totient is φ = 37385856.

The previous prime is 140721533. The next prime is 140721551. The reversal of 140721540 is 45127041.

140721540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 140721540.

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, 12387 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (8239364).

Almost surely, 2^140721540 is an apocalyptic number.

140721540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140721540 is an abundant number, since it is smaller than the sum of its proper divisors (254767932).

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

140721540 is a wasteful number, since it uses less digits than its factorization.

140721540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8756 (or 8754 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 140721540 is about 11862.6110110717. The cubic root of 140721540 is about 520.1399278264.

Adding to 140721540 its reverse (45127041), we get a palindrome (185848581).

The spelling of 140721540 in words is "one hundred forty million, seven hundred twenty-one thousand, five hundred forty".