138698851 has 4 divisors (see below), whose sum is σ = 143481600. Its totient is φ = 133916104.

The previous prime is 138698843. The next prime is 138698863. The reversal of 138698851 is 158896831.

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 138698851 - 2³ = 138698843 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138698795 and 138698804.

It is not an unprimeable number, because it can be changed into a prime (138698831) 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, 2391331 + ... + 2391388.

It is an arithmetic number, because the mean of its divisors is an integer number (35870400).

Almost surely, 2^138698851 is an apocalyptic number.

138698851 is a deficient number, since it is larger than the sum of its proper divisors (4782749).

138698851 is an equidigital number, since it uses as much as digits as its factorization.

138698851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782748.

The product of its digits is 414720, while the sum is 49.

The square root of 138698851 is about 11777.0476351249. The cubic root of 138698851 is about 517.6357797542.

The spelling of 138698851 in words is "one hundred thirty-eight million, six hundred ninety-eight thousand, eight hundred fifty-one".