138386826 has 16 divisors (see below), whose sum is σ = 307526400. Its totient is φ = 46128924.

The previous prime is 138386777. The next prime is 138386839. The reversal of 138386826 is 628683831.

It is a super-2 number, since 2×138386826² = 38301827220708552, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281306 + ... + 1281413.

It is an arithmetic number, because the mean of its divisors is an integer number (19220400).

Almost surely, 2^138386826 is an apocalyptic number.

138386826 is an abundant number, since it is smaller than the sum of its proper divisors (169139574).

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

138386826 is a wasteful number, since it uses less digits than its factorization.

138386826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562730 (or 2562724 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 138386826 is about 11763.7930107598. The cubic root of 138386826 is about 517.2473204587.

It can be divided in two parts, 1383 and 86826, that added together give a square (88209 = 297²).

The spelling of 138386826 in words is "one hundred thirty-eight million, three hundred eighty-six thousand, eight hundred twenty-six".