138497775 has 24 divisors (see below), whose sum is σ = 246598800. Its totient is φ = 68183040.

The previous prime is 138497773. The next prime is 138497809. The reversal of 138497775 is 577794831.

138497775 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 138497775 - 2¹ = 138497773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138497773) 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, 70050 + ... + 71999.

It is an arithmetic number, because the mean of its divisors is an integer number (10274950).

Almost surely, 2^138497775 is an apocalyptic number.

138497775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138497775 is a deficient number, since it is larger than the sum of its proper divisors (108101025).

138497775 is a wasteful number, since it uses less digits than its factorization.

138497775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142075 (or 142070 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 51.

The square root of 138497775 is about 11768.5077643684. The cubic root of 138497775 is about 517.3855145938.

The spelling of 138497775 in words is "one hundred thirty-eight million, four hundred ninety-seven thousand, seven hundred seventy-five".