139545687 has 4 divisors (see below), whose sum is σ = 186060920. Its totient is φ = 93030456.

The previous prime is 139545649. The next prime is 139545691. The reversal of 139545687 is 786545931.

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

It is not a de Polignac number, because 139545687 - 2⁸ = 139545431 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 (139545487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23257612 + ... + 23257617.

It is an arithmetic number, because the mean of its divisors is an integer number (46515230).

Almost surely, 2^139545687 is an apocalyptic number.

139545687 is a deficient number, since it is larger than the sum of its proper divisors (46515233).

139545687 is an equidigital number, since it uses as much as digits as its factorization.

139545687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46515232.

The product of its digits is 907200, while the sum is 48.

The square root of 139545687 is about 11812.9457376219. The cubic root of 139545687 is about 518.6871306787.

The spelling of 139545687 in words is "one hundred thirty-nine million, five hundred forty-five thousand, six hundred eighty-seven".