138244006 has 4 divisors (see below), whose sum is σ = 207366012. Its totient is φ = 69122002.

The previous prime is 138243997. The next prime is 138244009. The reversal of 138244006 is 600442831.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×138244006² = 38222810389856072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138244009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34561000 + ... + 34561003.

It is an arithmetic number, because the mean of its divisors is an integer number (51841503).

Almost surely, 2^138244006 is an apocalyptic number.

138244006 is a deficient number, since it is larger than the sum of its proper divisors (69122006).

138244006 is an equidigital number, since it uses as much as digits as its factorization.

138244006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69122005.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 138244006 is about 11757.7211227346. The cubic root of 138244006 is about 517.0693201574.

Adding to 138244006 its reverse (600442831), we get a palindrome (738686837).

The spelling of 138244006 in words is "one hundred thirty-eight million, two hundred forty-four thousand, six".