140321540 has 12 divisors (see below), whose sum is σ = 294675276. Its totient is φ = 56128608.

The previous prime is 140321539. The next prime is 140321563. The reversal of 140321540 is 45123041.

It can be written as a sum of positive squares in 2 ways, for example, as 32535616 + 107785924 = 5704^2 + 10382^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 7016077 = 140321540 / (1 + 4 + 0 + 3 + 2 + 1 + 5 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3508019 + ... + 3508058.

It is an arithmetic number, because the mean of its divisors is an integer number (24556273).

Almost surely, 2^140321540 is an apocalyptic number.

140321540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140321540 is an abundant number, since it is smaller than the sum of its proper divisors (154353736).

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

140321540 is a wasteful number, since it uses less digits than its factorization.

140321540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7016086 (or 7016084 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 140321540 is about 11845.7393184216. The cubic root of 140321540 is about 519.6466287537.

Adding to 140321540 its reverse (45123041), we get a palindrome (185444581).

The spelling of 140321540 in words is "one hundred forty million, three hundred twenty-one thousand, five hundred forty".