138245775 has 12 divisors (see below), whose sum is σ = 228566472. Its totient is φ = 73731040.

The previous prime is 138245761. The next prime is 138245777. The reversal of 138245775 is 577542831.

It is not a de Polignac number, because 138245775 - 2⁸ = 138245519 is a prime.

It is a super-2 number, since 2×138245775² = 38223788610701250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138245777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 921564 + ... + 921713.

It is an arithmetic number, because the mean of its divisors is an integer number (19047206).

Almost surely, 2^138245775 is an apocalyptic number.

138245775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138245775 is a deficient number, since it is larger than the sum of its proper divisors (90320697).

138245775 is a wasteful number, since it uses less digits than its factorization.

138245775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843290 (or 1843285 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The square root of 138245775 is about 11757.7963496567. The cubic root of 138245775 is about 517.0715256580.

The spelling of 138245775 in words is "one hundred thirty-eight million, two hundred forty-five thousand, seven hundred seventy-five".