138928567 has 2 divisors, whose sum is σ = 138928568. Its totient is φ = 138928566.

The previous prime is 138928499. The next prime is 138928583. The reversal of 138928567 is 765829831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138928567 is a prime.

It is a super-2 number, since 2×138928567² = 38602293457346978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138928567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138928597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69464283 + 69464284.

It is an arithmetic number, because the mean of its divisors is an integer number (69464284).

Almost surely, 2^138928567 is an apocalyptic number.

138928567 is a deficient number, since it is larger than the sum of its proper divisors (1).

138928567 is an equidigital number, since it uses as much as digits as its factorization.

138928567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 138928567 is about 11786.7962992494. The cubic root of 138928567 is about 517.9213952768.

The spelling of 138928567 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, five hundred sixty-seven".