138896423 has 2 divisors, whose sum is σ = 138896424. Its totient is φ = 138896422.

The previous prime is 138896419. The next prime is 138896431. The reversal of 138896423 is 324698831.

It is a weak prime.

It is an emirp because it is prime and its reverse (324698831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138896423 - 2² = 138896419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138896413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69448211 + 69448212.

It is an arithmetic number, because the mean of its divisors is an integer number (69448212).

Almost surely, 2^138896423 is an apocalyptic number.

138896423 is a deficient number, since it is larger than the sum of its proper divisors (1).

138896423 is an equidigital number, since it uses as much as digits as its factorization.

138896423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 138896423 is about 11785.4326607045. The cubic root of 138896423 is about 517.8814482503.

The spelling of 138896423 in words is "one hundred thirty-eight million, eight hundred ninety-six thousand, four hundred twenty-three".