139028687 has 8 divisors (see below), whose sum is σ = 159348000. Its totient is φ = 118823904.

The previous prime is 139028683. The next prime is 139028689. The reversal of 139028687 is 786820931.

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

It is a cyclic number.

It is not a de Polignac number, because 139028687 - 2² = 139028683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139028683) 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 in 7 ways as a sum of consecutive naturals, for example, 26012 + ... + 30897.

It is an arithmetic number, because the mean of its divisors is an integer number (19918500).

Almost surely, 2^139028687 is an apocalyptic number.

139028687 is a deficient number, since it is larger than the sum of its proper divisors (20319313).

139028687 is an equidigital number, since it uses as much as digits as its factorization.

139028687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57265.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 139028687 is about 11791.0426595785. The cubic root of 139028687 is about 518.0457801551.

The spelling of 139028687 in words is "one hundred thirty-nine million, twenty-eight thousand, six hundred eighty-seven".