138900037 has 2 divisors, whose sum is σ = 138900038. Its totient is φ = 138900036.

The previous prime is 138900029. The next prime is 138900043. The reversal of 138900037 is 730009831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106626276 + 32273761 = 10326^2 + 5681^2 .

It is a cyclic number.

It is not a de Polignac number, because 138900037 - 2³ = 138900029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138899981 and 138900008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138900007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69450018 + 69450019.

It is an arithmetic number, because the mean of its divisors is an integer number (69450019).

Almost surely, 2^138900037 is an apocalyptic number.

It is an amenable number.

138900037 is a deficient number, since it is larger than the sum of its proper divisors (1).

138900037 is an equidigital number, since it uses as much as digits as its factorization.

138900037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 138900037 is about 11785.5859845830. The cubic root of 138900037 is about 517.8859398642.

Adding to 138900037 its reverse (730009831), we get a palindrome (868909868).

The spelling of 138900037 in words is "one hundred thirty-eight million, nine hundred thousand, thirty-seven".