140665807 has 2 divisors, whose sum is σ = 140665808. Its totient is φ = 140665806.

The previous prime is 140665799. The next prime is 140665829. The reversal of 140665807 is 708566041.

140665807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (708566041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140665807 - 2³ = 140665799 is a prime.

It is a super-2 number, since 2×140665807² = 39573738517922498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140665867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70332903 + 70332904.

It is an arithmetic number, because the mean of its divisors is an integer number (70332904).

Almost surely, 2^140665807 is an apocalyptic number.

140665807 is a deficient number, since it is larger than the sum of its proper divisors (1).

140665807 is an equidigital number, since it uses as much as digits as its factorization.

140665807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 140665807 is about 11860.2616750222. The cubic root of 140665807 is about 520.0712513312.

The spelling of 140665807 in words is "one hundred forty million, six hundred sixty-five thousand, eight hundred seven".