138698775 has 18 divisors (see below), whose sum is σ = 248425320. Its totient is φ = 73972560.

The previous prime is 138698773. The next prime is 138698783. The reversal of 138698775 is 577896831.

It is not a de Polignac number, because 138698775 - 2¹ = 138698773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138698773) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 307995 + ... + 308444.

Almost surely, 2^138698775 is an apocalyptic number.

138698775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138698775 is a deficient number, since it is larger than the sum of its proper divisors (109726545).

138698775 is a wasteful number, since it uses less digits than its factorization.

138698775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616455 (or 616447 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 138698775 is about 11777.0444085093. The cubic root of 138698775 is about 517.6356852080.

The spelling of 138698775 in words is "one hundred thirty-eight million, six hundred ninety-eight thousand, seven hundred seventy-five".