138329838 has 24 divisors (see below), whose sum is σ = 299941200. Its totient is φ = 46075104.

The previous prime is 138329831. The next prime is 138329879. The reversal of 138329838 is 838923831.

It is a super-2 number, since 2×138329838² = 38270288162212488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138329793 and 138329802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138329831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34818 + ... + 38586.

It is an arithmetic number, because the mean of its divisors is an integer number (12497550).

Almost surely, 2^138329838 is an apocalyptic number.

138329838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138329838 is an abundant number, since it is smaller than the sum of its proper divisors (161611362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138329838 is a wasteful number, since it uses less digits than its factorization.

138329838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 5813 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 138329838 is about 11761.3705833972. The cubic root of 138329838 is about 517.1763095147.

The spelling of 138329838 in words is "one hundred thirty-eight million, three hundred twenty-nine thousand, eight hundred thirty-eight".