138157488 has 200 divisors, whose sum is σ = 464643872. Its totient is φ = 38817792.

The previous prime is 138157463. The next prime is 138157489. The reversal of 138157488 is 884751831.

It is a happy number.

138157488 is a `hidden beast` number, since 13 + 8 + 157 + 488 = 666.

It is not an unprimeable number, because it can be changed into a prime (138157489) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 879906 + ... + 880062.

Almost surely, 2^138157488 is an apocalyptic number.

138157488 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 138157488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232321936).

138157488 is an abundant number, since it is smaller than the sum of its proper divisors (326486384).

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

138157488 is a wasteful number, since it uses less digits than its factorization.

138157488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 266 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 138157488 is about 11754.0413475536. The cubic root of 138157488 is about 516.9614308767.

The spelling of 138157488 in words is "one hundred thirty-eight million, one hundred fifty-seven thousand, four hundred eighty-eight".