139973287 has 8 divisors (see below), whose sum is σ = 140943296. Its totient is φ = 139007232.

The previous prime is 139973263. The next prime is 139973321. The reversal of 139973287 is 782379931.

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 139973287 - 2²⁷ = 5755559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139973287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139971287) 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, 104818 + ... + 106144.

It is an arithmetic number, because the mean of its divisors is an integer number (17617912).

Almost surely, 2^139973287 is an apocalyptic number.

139973287 is a deficient number, since it is larger than the sum of its proper divisors (970009).

139973287 is a wasteful number, since it uses less digits than its factorization.

139973287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977.

The product of its digits is 571536, while the sum is 49.

The square root of 139973287 is about 11831.0306820665. The cubic root of 139973287 is about 519.2163825856.

The spelling of 139973287 in words is "one hundred thirty-nine million, nine hundred seventy-three thousand, two hundred eighty-seven".