140146865 has 4 divisors (see below), whose sum is σ = 168176244. Its totient is φ = 112117488.

The previous prime is 140146817. The next prime is 140146873. The reversal of 140146865 is 568641041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568641041 = 17 ⋅33449473.

It can be written as a sum of positive squares in 2 ways, for example, as 43930384 + 96216481 = 6628^2 + 9809^2 .

It is a cyclic number.

It is not a de Polignac number, because 140146865 - 2⁶ = 140146801 is a prime.

It is a super-2 number, since 2×140146865² = 39282287538656450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14014682 + ... + 14014691.

It is an arithmetic number, because the mean of its divisors is an integer number (42044061).

Almost surely, 2^140146865 is an apocalyptic number.

It is an amenable number.

140146865 is a deficient number, since it is larger than the sum of its proper divisors (28029379).

140146865 is an equidigital number, since it uses as much as digits as its factorization.

140146865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28029378.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 140146865 is about 11838.3641184076. The cubic root of 140146865 is about 519.4309171228.

The spelling of 140146865 in words is "one hundred forty million, one hundred forty-six thousand, eight hundred sixty-five".