138261006 has 40 divisors (see below), whose sum is σ = 333643464. Its totient is φ = 42541200.

The previous prime is 138260989. The next prime is 138261041. The reversal of 138261006 is 600162831.

It is a super-2 number, since 2×138261006² = 38232211560264072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30720 + ... + 34931.

Almost surely, 2^138261006 is an apocalyptic number.

138261006 is an abundant number, since it is smaller than the sum of its proper divisors (195382458).

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

138261006 is a wasteful number, since it uses less digits than its factorization.

138261006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65678 (or 65669 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 138261006 is about 11758.4440297175. Note that the first 3 decimals coincide. The cubic root of 138261006 is about 517.0905141279.

It can be divided in two parts, 138 and 261006, that multiplied together give a triangular number (36018828 = T₈₄₈₇).

The spelling of 138261006 in words is "one hundred thirty-eight million, two hundred sixty-one thousand, six".