140705857 has 4 divisors (see below), whose sum is σ = 144508756. Its totient is φ = 136902960.

The previous prime is 140705843. The next prime is 140705863. The reversal of 140705857 is 758507041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 136445761 + 4260096 = 11681^2 + 2064^2 .

It is not a de Polignac number, because 140705857 - 2⁷ = 140705729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3802861 = 140705857 / (1 + 4 + 0 + 7 + 0 + 5 + 8 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140705837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1901394 + ... + 1901467.

It is an arithmetic number, because the mean of its divisors is an integer number (36127189).

Almost surely, 2^140705857 is an apocalyptic number.

140705857 is the 6849-th hex number.

It is an amenable number.

140705857 is a deficient number, since it is larger than the sum of its proper divisors (3802899).

140705857 is an equidigital number, since it uses as much as digits as its factorization.

140705857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802898.

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 140705857 is about 11861.9499661734. The cubic root of 140705857 is about 520.1206044223.

The spelling of 140705857 in words is "one hundred forty million, seven hundred five thousand, eight hundred fifty-seven".