140640289 has 4 divisors (see below), whose sum is σ = 140673024. Its totient is φ = 140607556.

The previous prime is 140640287. The next prime is 140640301. The reversal of 140640289 is 982046041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982046041 = 23561 ⋅41681.

It is a cyclic number.

It is not a de Polignac number, because 140640289 - 2¹ = 140640287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140640287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8737 + ... + 18910.

It is an arithmetic number, because the mean of its divisors is an integer number (35168256).

Almost surely, 2^140640289 is an apocalyptic number.

It is an amenable number.

140640289 is a deficient number, since it is larger than the sum of its proper divisors (32735).

140640289 is an equidigital number, since it uses as much as digits as its factorization.

140640289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32734.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 140640289 is about 11859.1858489527. The cubic root of 140640289 is about 520.0398009476.

The spelling of 140640289 in words is "one hundred forty million, six hundred forty thousand, two hundred eighty-nine".