138692401 has 2 divisors, whose sum is σ = 138692402. Its totient is φ = 138692400.

The previous prime is 138692399. The next prime is 138692423. The reversal of 138692401 is 104296831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138674176 + 18225 = 11776^2 + 135^2 .

It is an emirp because it is prime and its reverse (104296831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138692401 - 2¹ = 138692399 is a prime.

Together with 138692399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138692201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69346200 + 69346201.

It is an arithmetic number, because the mean of its divisors is an integer number (69346201).

Almost surely, 2^138692401 is an apocalyptic number.

It is an amenable number.

138692401 is a deficient number, since it is larger than the sum of its proper divisors (1).

138692401 is an equidigital number, since it uses as much as digits as its factorization.

138692401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 138692401 is about 11776.7737942104. The cubic root of 138692401 is about 517.6277556489.

The spelling of 138692401 in words is "one hundred thirty-eight million, six hundred ninety-two thousand, four hundred one".