138235146 has 64 divisors (see below), whose sum is σ = 334264320. Its totient is φ = 37229760.

The previous prime is 138235121. The next prime is 138235147. The reversal of 138235146 is 641532831.

It is not an unprimeable number, because it can be changed into a prime (138235147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247900 + ... + 248456.

It is an arithmetic number, because the mean of its divisors is an integer number (5222880).

Almost surely, 2^138235146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138235146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167132160).

138235146 is an abundant number, since it is smaller than the sum of its proper divisors (196029174).

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

138235146 is a wasteful number, since it uses less digits than its factorization.

138235146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its digits is 17280, while the sum is 33.

The square root of 138235146 is about 11757.3443430054. The cubic root of 138235146 is about 517.0582736699.

Adding to 138235146 its reverse (641532831), we get a palindrome (779767977).

The spelling of 138235146 in words is "one hundred thirty-eight million, two hundred thirty-five thousand, one hundred forty-six".