139987243 has 16 divisors (see below), whose sum is σ = 160685280. Its totient is φ = 120787200.

The previous prime is 139987229. The next prime is 139987247. The reversal of 139987243 is 342789931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139987243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139987193 and 139987202.

It is not an unprimeable number, because it can be changed into a prime (139987247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12493 + ... + 20881.

It is an arithmetic number, because the mean of its divisors is an integer number (10042830).

Almost surely, 2^139987243 is an apocalyptic number.

139987243 is a deficient number, since it is larger than the sum of its proper divisors (20698037).

139987243 is a wasteful number, since it uses less digits than its factorization.

139987243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8478.

The product of its digits is 326592, while the sum is 46.

The square root of 139987243 is about 11831.6204722768. The cubic root of 139987243 is about 519.2336381234.

The spelling of 139987243 in words is "one hundred thirty-nine million, nine hundred eighty-seven thousand, two hundred forty-three".