138167928 has 96 divisors (see below), whose sum is σ = 384655440. Its totient is φ = 44789760.

The previous prime is 138167819. The next prime is 138167933. The reversal of 138167928 is 829761831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 715800 + ... + 715992.

Almost surely, 2^138167928 is an apocalyptic number.

138167928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138167928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192327720).

138167928 is an abundant number, since it is smaller than the sum of its proper divisors (246487512).

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

138167928 is a wasteful number, since it uses less digits than its factorization.

138167928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 422 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 138167928 is about 11754.4854417367. The cubic root of 138167928 is about 516.9744521070.

The spelling of 138167928 in words is "one hundred thirty-eight million, one hundred sixty-seven thousand, nine hundred twenty-eight".