138956859 has 24 divisors (see below), whose sum is σ = 205470720. Its totient is φ = 90464688.

The previous prime is 138956821. The next prime is 138956879. The reversal of 138956859 is 958659831.

It is a happy number.

It is not a de Polignac number, because 138956859 - 2¹⁵ = 138924091 is a prime.

It is a super-3 number, since 3×138956859³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138956819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87894 + ... + 89460.

It is an arithmetic number, because the mean of its divisors is an integer number (8561280).

Almost surely, 2^138956859 is an apocalyptic number.

138956859 is a deficient number, since it is larger than the sum of its proper divisors (66513861).

138956859 is a wasteful number, since it uses less digits than its factorization.

138956859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 1796 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The square root of 138956859 is about 11787.9963946381. The cubic root of 138956859 is about 517.9565501239.

The spelling of 138956859 in words is "one hundred thirty-eight million, nine hundred fifty-six thousand, eight hundred fifty-nine".