138985699 has 4 divisors (see below), whose sum is σ = 139838536. Its totient is φ = 138132864.

The previous prime is 138985697. The next prime is 138985709. The reversal of 138985699 is 996589831.

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

It is a cyclic number.

It is not a de Polignac number, because 138985699 - 2¹ = 138985697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138985697) 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, 426174 + ... + 426499.

It is an arithmetic number, because the mean of its divisors is an integer number (34959634).

Almost surely, 2^138985699 is an apocalyptic number.

138985699 is a deficient number, since it is larger than the sum of its proper divisors (852837).

138985699 is an equidigital number, since it uses as much as digits as its factorization.

138985699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852836.

The product of its digits is 4199040, while the sum is 58.

The square root of 138985699 is about 11789.2196094568. The cubic root of 138985699 is about 517.9923809894.

The spelling of 138985699 in words is "one hundred thirty-eight million, nine hundred eighty-five thousand, six hundred ninety-nine".