139684287 has 8 divisors (see below), whose sum is σ = 191279536. Its totient is φ = 90605952.

The previous prime is 139684277. The next prime is 139684289. The reversal of 139684287 is 782486931.

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

It is not a de Polignac number, because 139684287 - 2²⁶ = 72575423 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 (139684289) 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, 629098 + ... + 629319.

It is an arithmetic number, because the mean of its divisors is an integer number (23909942).

Almost surely, 2^139684287 is an apocalyptic number.

139684287 is a deficient number, since it is larger than the sum of its proper divisors (51595249).

139684287 is a wasteful number, since it uses less digits than its factorization.

139684287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258457.

The product of its digits is 580608, while the sum is 48.

The square root of 139684287 is about 11818.8107269725. The cubic root of 139684287 is about 518.8587978701.

The spelling of 139684287 in words is "one hundred thirty-nine million, six hundred eighty-four thousand, two hundred eighty-seven".