138453397 has 2 divisors, whose sum is σ = 138453398. Its totient is φ = 138453396.

The previous prime is 138453391. The next prime is 138453401. The reversal of 138453397 is 793354831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138438756 + 14641 = 11766^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 138453397 - 2²³ = 130064789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138453391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69226698 + 69226699.

It is an arithmetic number, because the mean of its divisors is an integer number (69226699).

Almost surely, 2^138453397 is an apocalyptic number.

It is an amenable number.

138453397 is a deficient number, since it is larger than the sum of its proper divisors (1).

138453397 is an equidigital number, since it uses as much as digits as its factorization.

138453397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 138453397 is about 11766.6221576118. The cubic root of 138453397 is about 517.3302477921.

The spelling of 138453397 in words is "one hundred thirty-eight million, four hundred fifty-three thousand, three hundred ninety-seven".