138772943 has 4 divisors (see below), whose sum is σ = 138796680. Its totient is φ = 138749208.

The previous prime is 138772939. The next prime is 138772973. The reversal of 138772943 is 349277831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 138772943 - 2² = 138772939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138772894 and 138772903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138772913) 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, 3773 + ... + 17081.

It is an arithmetic number, because the mean of its divisors is an integer number (34699170).

Almost surely, 2^138772943 is an apocalyptic number.

138772943 is a deficient number, since it is larger than the sum of its proper divisors (23737).

138772943 is a wasteful number, since it uses less digits than its factorization.

138772943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23736.

The product of its digits is 254016, while the sum is 44.

The square root of 138772943 is about 11780.1928252470. The cubic root of 138772943 is about 517.7279358720.

The spelling of 138772943 in words is "one hundred thirty-eight million, seven hundred seventy-two thousand, nine hundred forty-three".