138428270 has 8 divisors (see below), whose sum is σ = 249170904. Its totient is φ = 55371304.

The previous prime is 138428249. The next prime is 138428317. The reversal of 138428270 is 72824831.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138428270.

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 3 ways as a sum of consecutive naturals, for example, 6921404 + ... + 6921423.

It is an arithmetic number, because the mean of its divisors is an integer number (31146363).

Almost surely, 2^138428270 is an apocalyptic number.

138428270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138428270 is a deficient number, since it is larger than the sum of its proper divisors (110742634).

138428270 is a wasteful number, since it uses less digits than its factorization.

138428270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13842834.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 138428270 is about 11765.5543855783. The cubic root of 138428270 is about 517.2989502729.

The spelling of 138428270 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, two hundred seventy".