138572837 has 4 divisors (see below), whose sum is σ = 149232300. Its totient is φ = 127913376.

The previous prime is 138572813. The next prime is 138572843. The reversal of 138572837 is 738275831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5885476 + 132687361 = 2426^2 + 11519^2 .

It is a cyclic number.

It is not a de Polignac number, because 138572837 - 2¹⁰ = 138571813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138572867) 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, 5329712 + ... + 5329737.

It is an arithmetic number, because the mean of its divisors is an integer number (37308075).

Almost surely, 2^138572837 is an apocalyptic number.

It is an amenable number.

138572837 is a deficient number, since it is larger than the sum of its proper divisors (10659463).

138572837 is a wasteful number, since it uses less digits than its factorization.

138572837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10659462.

The product of its digits is 282240, while the sum is 44.

The square root of 138572837 is about 11771.6964367928. The cubic root of 138572837 is about 517.4789673047.

The spelling of 138572837 in words is "one hundred thirty-eight million, five hundred seventy-two thousand, eight hundred thirty-seven".