140306687 has 4 divisors (see below), whose sum is σ = 140592936. Its totient is φ = 140020440.

The previous prime is 140306599. The next prime is 140306689. The reversal of 140306687 is 786603041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786603041 = 7 ⋅112371863.

It is a cyclic number.

It is not a de Polignac number, because 140306687 - 2¹⁶ = 140241151 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 (140306689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142388 + ... + 143369.

It is an arithmetic number, because the mean of its divisors is an integer number (35148234).

Almost surely, 2^140306687 is an apocalyptic number.

140306687 is a deficient number, since it is larger than the sum of its proper divisors (286249).

140306687 is an equidigital number, since it uses as much as digits as its factorization.

140306687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286248.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 140306687 is about 11845.1123675548. The cubic root of 140306687 is about 519.6282932847.

The spelling of 140306687 in words is "one hundred forty million, three hundred six thousand, six hundred eighty-seven".