139809587 has 2 divisors, whose sum is σ = 139809588. Its totient is φ = 139809586.

The previous prime is 139809577. The next prime is 139809653. The reversal of 139809587 is 785908931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139809587 - 2⁸ = 139809331 is a prime.

It is a super-2 number, since 2×139809587² = 39093441234221138, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (139809557) by changing a digit.

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 as a sum of consecutive naturals, namely, 69904793 + 69904794.

It is an arithmetic number, because the mean of its divisors is an integer number (69904794).

Almost surely, 2^139809587 is an apocalyptic number.

139809587 is a deficient number, since it is larger than the sum of its proper divisors (1).

139809587 is an equidigital number, since it uses as much as digits as its factorization.

139809587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 139809587 is about 11824.1104105129. The cubic root of 139809587 is about 519.0138942403.

The spelling of 139809587 in words is "one hundred thirty-nine million, eight hundred nine thousand, five hundred eighty-seven".