138151644 has 24 divisors (see below), whose sum is σ = 322860048. Its totient is φ = 45978240.

The previous prime is 138151631. The next prime is 138151649. The reversal of 138151644 is 446151831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138151649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777 + ... + 16640.

It is an arithmetic number, because the mean of its divisors is an integer number (13452502).

Almost surely, 2^138151644 is an apocalyptic number.

It is an amenable number.

138151644 is an abundant number, since it is smaller than the sum of its proper divisors (184708404).

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

138151644 is a wasteful number, since it uses less digits than its factorization.

138151644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18085 (or 18083 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 138151644 is about 11753.7927495766. The cubic root of 138151644 is about 516.9541416948.

The spelling of 138151644 in words is "one hundred thirty-eight million, one hundred fifty-one thousand, six hundred forty-four".