138433386 has 64 divisors (see below), whose sum is σ = 345655296. Its totient is φ = 35985600.

The previous prime is 138433381. The next prime is 138433387. The reversal of 138433386 is 683334831.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138433381) 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, 36981 + ... + 40551.

It is an arithmetic number, because the mean of its divisors is an integer number (5400864).

Almost surely, 2^138433386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138433386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172827648).

138433386 is an abundant number, since it is smaller than the sum of its proper divisors (207221910).

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

138433386 is a wasteful number, since it uses less digits than its factorization.

138433386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667.

The product of its digits is 124416, while the sum is 39.

The square root of 138433386 is about 11765.7717978890. The cubic root of 138433386 is about 517.3053229327.

The spelling of 138433386 in words is "one hundred thirty-eight million, four hundred thirty-three thousand, three hundred eighty-six".