138256895 has 8 divisors (see below), whose sum is σ = 189609504. Its totient is φ = 94804704.

The previous prime is 138256871. The next prime is 138256897. The reversal of 138256895 is 598652831.

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 138256895 - 2¹² = 138252799 is a prime.

It is a super-2 number, since 2×138256895² = 38229938030082050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138256897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1975064 + ... + 1975133.

It is an arithmetic number, because the mean of its divisors is an integer number (23701188).

Almost surely, 2^138256895 is an apocalyptic number.

138256895 is a deficient number, since it is larger than the sum of its proper divisors (51352609).

138256895 is an equidigital number, since it uses as much as digits as its factorization.

138256895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950209.

The product of its digits is 518400, while the sum is 47.

The square root of 138256895 is about 11758.2692178739. The cubic root of 138256895 is about 517.0853890864.

The spelling of 138256895 in words is "one hundred thirty-eight million, two hundred fifty-six thousand, eight hundred ninety-five".