138928499 has 2 divisors, whose sum is σ = 138928500. Its totient is φ = 138928498.

The previous prime is 138928409. The next prime is 138928567. The reversal of 138928499 is 994829831.

138928499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138928499 - 2¹² = 138924403 is a prime.

It is a super-2 number, since 2×138928499² = 38602255668786002, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138928499.

It is not a weakly prime, because it can be changed into another prime (138928409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69464249 + 69464250.

It is an arithmetic number, because the mean of its divisors is an integer number (69464250).

Almost surely, 2^138928499 is an apocalyptic number.

138928499 is a deficient number, since it is larger than the sum of its proper divisors (1).

138928499 is an equidigital number, since it uses as much as digits as its factorization.

138928499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 138928499 is about 11786.7934146654. The cubic root of 138928499 is about 517.9213107762.

The spelling of 138928499 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, four hundred ninety-nine".