138820037 has 4 divisors (see below), whose sum is σ = 138858720. Its totient is φ = 138781356.

The previous prime is 138820027. The next prime is 138820057. The reversal of 138820037 is 730028831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 730028831 = 7 ⋅104289833.

It is a cyclic number.

It is not a de Polignac number, because 138820037 - 2¹⁰ = 138819013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138819985 and 138820012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138820027) 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, 13337 + ... + 21342.

It is an arithmetic number, because the mean of its divisors is an integer number (34714680).

Almost surely, 2^138820037 is an apocalyptic number.

It is an amenable number.

138820037 is a deficient number, since it is larger than the sum of its proper divisors (38683).

138820037 is an equidigital number, since it uses as much as digits as its factorization.

138820037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38682.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 138820037 is about 11782.1915194076. The cubic root of 138820037 is about 517.7864946500.

Adding to 138820037 its reverse (730028831), we get a palindrome (868848868).

The spelling of 138820037 in words is "one hundred thirty-eight million, eight hundred twenty thousand, thirty-seven".