138497774 has 8 divisors (see below), whose sum is σ = 208002168. Its totient is φ = 69163720.

The previous prime is 138497773. The next prime is 138497809. The reversal of 138497774 is 477794831.

138497774 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40532 + ... + 43815.

It is an arithmetic number, because the mean of its divisors is an integer number (26000271).

Almost surely, 2^138497774 is an apocalyptic number.

138497774 is a deficient number, since it is larger than the sum of its proper divisors (69504394).

138497774 is an equidigital number, since it uses as much as digits as its factorization.

138497774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85170.

The product of its digits is 1185408, while the sum is 50.

The square root of 138497774 is about 11768.5077218822. The cubic root of 138497774 is about 517.3855133485.

The spelling of 138497774 in words is "one hundred thirty-eight million, four hundred ninety-seven thousand, seven hundred seventy-four".