138743766 has 96 divisors (see below), whose sum is σ = 377395200. Its totient is φ = 37293696.

The previous prime is 138743753. The next prime is 138743779. The reversal of 138743766 is 667347831.

It is an interprime number because it is at equal distance from previous prime (138743753) and next prime (138743779).

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 47 ways as a sum of consecutive naturals, for example, 56635 + ... + 59033.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^138743766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138743766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188697600).

138743766 is an abundant number, since it is smaller than the sum of its proper divisors (238651434).

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

138743766 is a wasteful number, since it uses less digits than its factorization.

138743766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2428 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 138743766 is about 11778.9543678546. The cubic root of 138743766 is about 517.6916492433.

The spelling of 138743766 in words is "one hundred thirty-eight million, seven hundred forty-three thousand, seven hundred sixty-six".