139985647 has 4 divisors (see below), whose sum is σ = 141428896. Its totient is φ = 138542400.

The previous prime is 139985621. The next prime is 139985653. The reversal of 139985647 is 746589931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139985647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139985594 and 139985603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139985047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721479 + ... + 721672.

It is an arithmetic number, because the mean of its divisors is an integer number (35357224).

Almost surely, 2^139985647 is an apocalyptic number.

139985647 is a deficient number, since it is larger than the sum of its proper divisors (1443249).

139985647 is an equidigital number, since it uses as much as digits as its factorization.

139985647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443248.

The product of its digits is 1632960, while the sum is 52.

The square root of 139985647 is about 11831.5530257021. The cubic root of 139985647 is about 519.2316648482.

The spelling of 139985647 in words is "one hundred thirty-nine million, nine hundred eighty-five thousand, six hundred forty-seven".