138758442 has 32 divisors (see below), whose sum is σ = 283124160. Its totient is φ = 45323520.

The previous prime is 138758423. The next prime is 138758447. The reversal of 138758442 is 244857831.

It is a junction number, because it is equal to n+sod(n) for n = 138758394 and 138758403.

It is not an unprimeable number, because it can be changed into a prime (138758447) 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, 209592 + ... + 210252.

It is an arithmetic number, because the mean of its divisors is an integer number (8847630).

Almost surely, 2^138758442 is an apocalyptic number.

138758442 is an abundant number, since it is smaller than the sum of its proper divisors (144365718).

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

138758442 is a wasteful number, since it uses less digits than its factorization.

138758442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its digits is 215040, while the sum is 42.

The square root of 138758442 is about 11779.5773268823. The cubic root of 138758442 is about 517.7099020148.

The spelling of 138758442 in words is "one hundred thirty-eight million, seven hundred fifty-eight thousand, four hundred forty-two".