138745488 has 80 divisors (see below), whose sum is σ = 414894080. Its totient is φ = 39132288.

The previous prime is 138745487. The next prime is 138745493. The reversal of 138745488 is 884547831.

138745488 is nontrivially palindromic in base 9.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (138745487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23931 + ... + 29157.

It is an arithmetic number, because the mean of its divisors is an integer number (5186176).

Almost surely, 2^138745488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138745488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207447040).

138745488 is an abundant number, since it is smaller than the sum of its proper divisors (276148592).

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

138745488 is a wasteful number, since it uses less digits than its factorization.

138745488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324 (or 5318 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The square root of 138745488 is about 11779.0274640991. The cubic root of 138745488 is about 517.6937909884.

The spelling of 138745488 in words is "one hundred thirty-eight million, seven hundred forty-five thousand, four hundred eighty-eight".