138747775 has 18 divisors (see below), whose sum is σ = 173953400. Its totient is φ = 109779120.

The previous prime is 138747769. The next prime is 138747781. The reversal of 138747775 is 577747831.

It is an interprime number because it is at equal distance from previous prime (138747769) and next prime (138747781).

It is not a de Polignac number, because 138747775 - 2³ = 138747767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 697126 + ... + 697324.

Almost surely, 2^138747775 is an apocalyptic number.

138747775 is a deficient number, since it is larger than the sum of its proper divisors (35205625).

138747775 is an equidigital number, since it uses as much as digits as its factorization.

138747775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 371 counting only the distinct ones).

The product of its digits is 1152480, while the sum is 49.

The square root of 138747775 is about 11779.1245430210. The cubic root of 138747775 is about 517.6966354273.

The spelling of 138747775 in words is "one hundred thirty-eight million, seven hundred forty-seven thousand, seven hundred seventy-five".