138802385 has 8 divisors (see below), whose sum is σ = 166672680. Its totient is φ = 110968704.

The previous prime is 138802369. The next prime is 138802387. The reversal of 138802385 is 583208831.

It can be written as a sum of positive squares in 4 ways, for example, as 2660161 + 136142224 = 1631^2 + 11668^2 .

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 138802385 - 2⁴ = 138802369 is a prime.

It is a super-2 number, since 2×138802385² = 38532204163376450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138802387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (20834085).

Almost surely, 2^138802385 is an apocalyptic number.

It is an amenable number.

138802385 is a deficient number, since it is larger than the sum of its proper divisors (27870295).

138802385 is a wasteful number, since it uses less digits than its factorization.

138802385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18307.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 138802385 is about 11781.4423989595. The cubic root of 138802385 is about 517.7645469186.

The spelling of 138802385 in words is "one hundred thirty-eight million, eight hundred two thousand, three hundred eighty-five".