138161500 has 24 divisors (see below), whose sum is σ = 301745808. Its totient is φ = 55264400.

The previous prime is 138161477. The next prime is 138161501. The reversal of 138161500 is 5161831.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138161501) 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 7 ways as a sum of consecutive naturals, for example, 137662 + ... + 138661.

It is an arithmetic number, because the mean of its divisors is an integer number (12572742).

Almost surely, 2^138161500 is an apocalyptic number.

138161500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138161500 is an abundant number, since it is smaller than the sum of its proper divisors (163584308).

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

138161500 is a wasteful number, since it uses less digits than its factorization.

138161500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276342 (or 276330 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 138161500 is about 11754.2120110197. The cubic root of 138161500 is about 516.9664348984.

The spelling of 138161500 in words is "one hundred thirty-eight million, one hundred sixty-one thousand, five hundred".