138671764 has 36 divisors (see below), whose sum is σ = 307964160. Its totient is φ = 54027120.

The previous prime is 138671713. The next prime is 138671777. The reversal of 138671764 is 467176831.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 138671764.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 30004 + ... + 34315.

It is an arithmetic number, because the mean of its divisors is an integer number (8554560).

Almost surely, 2^138671764 is an apocalyptic number.

138671764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138671764 is an abundant number, since it is smaller than the sum of its proper divisors (169292396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138671764 is a wasteful number, since it uses less digits than its factorization.

138671764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64348 (or 64339 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 138671764 is about 11775.8975878699. The cubic root of 138671764 is about 517.6020805728.

The spelling of 138671764 in words is "one hundred thirty-eight million, six hundred seventy-one thousand, seven hundred sixty-four".