138870843 has 4 divisors (see below), whose sum is σ = 185161128. Its totient is φ = 92580560.

The previous prime is 138870839. The next prime is 138870863. The reversal of 138870843 is 348078831.

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 138870843 - 2² = 138870839 is a prime.

It is a super-2 number, since 2×138870843² = 38570222071061298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138870795 and 138870804.

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 3 ways as a sum of consecutive naturals, for example, 23145138 + ... + 23145143.

It is an arithmetic number, because the mean of its divisors is an integer number (46290282).

Almost surely, 2^138870843 is an apocalyptic number.

138870843 is a deficient number, since it is larger than the sum of its proper divisors (46290285).

138870843 is an equidigital number, since it uses as much as digits as its factorization.

138870843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46290284.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 138870843 is about 11784.3473726804. The cubic root of 138870843 is about 517.8496542451.

The spelling of 138870843 in words is "one hundred thirty-eight million, eight hundred seventy thousand, eight hundred forty-three".