140705689 has 4 divisors (see below), whose sum is σ = 141442560. Its totient is φ = 139968820.

The previous prime is 140705629. The next prime is 140705717. The reversal of 140705689 is 986507041.

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.

It is a cyclic number.

It is not a de Polignac number, because 140705689 - 2⁹ = 140705177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140705629) 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, 368149 + ... + 368530.

It is an arithmetic number, because the mean of its divisors is an integer number (35360640).

Almost surely, 2^140705689 is an apocalyptic number.

It is an amenable number.

140705689 is a deficient number, since it is larger than the sum of its proper divisors (736871).

140705689 is an equidigital number, since it uses as much as digits as its factorization.

140705689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736870.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 140705689 is about 11861.9428847048. The cubic root of 140705689 is about 520.1203974177.

The spelling of 140705689 in words is "one hundred forty million, seven hundred five thousand, six hundred eighty-nine".