138170724 has 12 divisors (see below), whose sum is σ = 322398384. Its totient is φ = 46056904.

The previous prime is 138170723. The next prime is 138170749. The reversal of 138170724 is 427071831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×138170724² = 38182297941368352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138170723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5757102 + ... + 5757125.

It is an arithmetic number, because the mean of its divisors is an integer number (26866532).

Almost surely, 2^138170724 is an apocalyptic number.

It is an amenable number.

138170724 is an abundant number, since it is smaller than the sum of its proper divisors (184227660).

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

138170724 is a wasteful number, since it uses less digits than its factorization.

138170724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11514234 (or 11514232 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 138170724 is about 11754.6043744568. The cubic root of 138170724 is about 516.9779392907.

The spelling of 138170724 in words is "one hundred thirty-eight million, one hundred seventy thousand, seven hundred twenty-four".