138870869 has 8 divisors (see below), whose sum is σ = 141566880. Its totient is φ = 136199376.

The previous prime is 138870863. The next prime is 138870871. The reversal of 138870869 is 968078831.

It is a happy number.

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 138870869 - 2¹² = 138866773 is a prime.

It is a super-2 number, since 2×138870869² = 38570236513630322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138870863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5519 + ... + 17555.

It is an arithmetic number, because the mean of its divisors is an integer number (17695860).

Almost surely, 2^138870869 is an apocalyptic number.

It is an amenable number.

138870869 is a deficient number, since it is larger than the sum of its proper divisors (2696011).

138870869 is a wasteful number, since it uses less digits than its factorization.

138870869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 138870869 is about 11784.3484758386. The cubic root of 138870869 is about 517.8496865632.

The spelling of 138870869 in words is "one hundred thirty-eight million, eight hundred seventy thousand, eight hundred sixty-nine".