139893287 has 4 divisors (see below), whose sum is σ = 140138856. Its totient is φ = 139647720.

The previous prime is 139893241. The next prime is 139893301. The reversal of 139893287 is 782398931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782398931 = 1291 ⋅606041.

It is a cyclic number.

It is not a de Polignac number, because 139893287 - 2⁸ = 139893031 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 (139893227) 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 3 ways as a sum of consecutive naturals, for example, 121928 + ... + 123069.

It is an arithmetic number, because the mean of its divisors is an integer number (35034714).

Almost surely, 2^139893287 is an apocalyptic number.

139893287 is a deficient number, since it is larger than the sum of its proper divisors (245569).

139893287 is an equidigital number, since it uses as much as digits as its factorization.

139893287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245568.

The product of its digits is 653184, while the sum is 50.

The square root of 139893287 is about 11827.6492592569. The cubic root of 139893287 is about 519.1174465019.

The spelling of 139893287 in words is "one hundred thirty-nine million, eight hundred ninety-three thousand, two hundred eighty-seven".