138031775 has 24 divisors (see below), whose sum is σ = 199615200. Its totient is φ = 94644480.

The previous prime is 138031771. The next prime is 138031781. The reversal of 138031775 is 577130831.

138031775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138031775 - 2² = 138031771 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138031771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 527 + ... + 16623.

It is an arithmetic number, because the mean of its divisors is an integer number (8317300).

Almost surely, 2^138031775 is an apocalyptic number.

138031775 is a deficient number, since it is larger than the sum of its proper divisors (61583425).

138031775 is an equidigital number, since it uses as much as digits as its factorization.

138031775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16128 (or 16109 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 138031775 is about 11748.6924804422. The cubic root of 138031775 is about 516.8045845247.

The spelling of 138031775 in words is "one hundred thirty-eight million, thirty-one thousand, seven hundred seventy-five".