138647401 has 2 divisors, whose sum is σ = 138647402. Its totient is φ = 138647400.

The previous prime is 138647371. The next prime is 138647441. The reversal of 138647401 is 104746831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138039001 + 608400 = 11749^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 138647401 - 2⁷ = 138647273 is a prime.

It is not a weakly prime, because it can be changed into another prime (138647441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69323700 + 69323701.

It is an arithmetic number, because the mean of its divisors is an integer number (69323701).

Almost surely, 2^138647401 is an apocalyptic number.

It is an amenable number.

138647401 is a deficient number, since it is larger than the sum of its proper divisors (1).

138647401 is an equidigital number, since it uses as much as digits as its factorization.

138647401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 138647401 is about 11774.8630989919. The cubic root of 138647401 is about 517.5717665956.

The spelling of 138647401 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, four hundred one".