140509685 has 8 divisors (see below), whose sum is σ = 170281656. Its totient is φ = 111294400.

The previous prime is 140509673. The next prime is 140509687. The reversal of 140509685 is 586905041.

It can be written as a sum of positive squares in 4 ways, for example, as 61246276 + 79263409 = 7826^2 + 8903^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 140509685 - 2²² = 136315381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140509687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138614 + ... + 139623.

It is an arithmetic number, because the mean of its divisors is an integer number (21285207).

Almost surely, 2^140509685 is an apocalyptic number.

It is an amenable number.

140509685 is a deficient number, since it is larger than the sum of its proper divisors (29771971).

140509685 is a wasteful number, since it uses less digits than its factorization.

140509685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278343.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 140509685 is about 11853.6781211572. The cubic root of 140509685 is about 519.8787747494.

The spelling of 140509685 in words is "one hundred forty million, five hundred nine thousand, six hundred eighty-five".