138143670 has 32 divisors (see below), whose sum is σ = 378908928. Its totient is φ = 31575648.

The previous prime is 138143653. The next prime is 138143701. The reversal of 138143670 is 76341831.

It is a super-2 number, since 2×138143670² = 38167347122137800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328704 + ... + 329123.

It is an arithmetic number, because the mean of its divisors is an integer number (11840904).

Almost surely, 2^138143670 is an apocalyptic number.

138143670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138143670 is an abundant number, since it is smaller than the sum of its proper divisors (240765258).

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

138143670 is a wasteful number, since it uses less digits than its factorization.

138143670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657844.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 138143670 is about 11753.4535350254. The cubic root of 138143670 is about 516.9441954465.

The spelling of 138143670 in words is "one hundred thirty-eight million, one hundred forty-three thousand, six hundred seventy".