140397841809 has 135 divisors (see below), whose sum is σ = 233162543691. Its totient is φ = 84171934080.

The previous prime is 140397841777. The next prime is 140397841817. The reversal of 140397841809 is 908148793041.

The square root of 140397841809 is 374697.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 109306278225 + 31091563584 = 330615^2 + 176328^2 .

It is not a de Polignac number, because 140397841809 - 2⁵ = 140397841777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140397841889) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1777187832 + ... + 1777187910.

Almost surely, 2^140397841809 is an apocalyptic number.

140397841809 is the 374697-th square number.

140397841809 is the 187349-th centered octagonal number.

It is an amenable number.

140397841809 is a deficient number, since it is larger than the sum of its proper divisors (92764701882).

140397841809 is an frugal number, since it uses more digits than its factorization.

140397841809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 140397841809 in words is "one hundred forty billion, three hundred ninety-seven million, eight hundred forty-one thousand, eight hundred nine".