138758447 has 2 divisors, whose sum is σ = 138758448. Its totient is φ = 138758446.

The previous prime is 138758423. The next prime is 138758461. The reversal of 138758447 is 744857831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138758447 - 2¹² = 138754351 is a prime.

It is a super-2 number, since 2×138758447² = 38507813227703618, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138755447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69379223 + 69379224.

It is an arithmetic number, because the mean of its divisors is an integer number (69379224).

Almost surely, 2^138758447 is an apocalyptic number.

138758447 is a deficient number, since it is larger than the sum of its proper divisors (1).

138758447 is an equidigital number, since it uses as much as digits as its factorization.

138758447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 47.

The square root of 138758447 is about 11779.5775391140. The cubic root of 138758447 is about 517.7099082332.

It can be divided in two parts, 13875 and 8447, that added together give a palindrome (22322).

The spelling of 138758447 in words is "one hundred thirty-eight million, seven hundred fifty-eight thousand, four hundred forty-seven".