138862973 has 4 divisors (see below), whose sum is σ = 138888540. Its totient is φ = 138837408.

The previous prime is 138862967. The next prime is 138862979. The reversal of 138862973 is 379268831.

138862973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 379268831 = 17519 ⋅21649.

It is an interprime number because it is at equal distance from previous prime (138862967) and next prime (138862979).

It can be written as a sum of positive squares in 2 ways, for example, as 69939769 + 68923204 = 8363^2 + 8302^2 .

It is a cyclic number.

It is not a de Polignac number, because 138862973 - 2⁶ = 138862909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138862979) 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, 1040 + ... + 16697.

It is an arithmetic number, because the mean of its divisors is an integer number (34722135).

Almost surely, 2^138862973 is an apocalyptic number.

It is an amenable number.

138862973 is a deficient number, since it is larger than the sum of its proper divisors (25567).

138862973 is an equidigital number, since it uses as much as digits as its factorization.

138862973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25566.

The product of its digits is 435456, while the sum is 47.

The square root of 138862973 is about 11784.0134504336. The cubic root of 138862973 is about 517.8398716450.

The spelling of 138862973 in words is "one hundred thirty-eight million, eight hundred sixty-two thousand, nine hundred seventy-three".