138240001 has 4 divisors (see below), whose sum is σ = 138468352. Its totient is φ = 138011652.

The previous prime is 138239999. The next prime is 138240061. The reversal of 138240001 is 100042831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138240001 - 2¹ = 138239999 is a prime.

It is a super-2 number, since 2×138240001² = 38220595752960002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138240061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113265 + ... + 114478.

It is an arithmetic number, because the mean of its divisors is an integer number (34617088).

Almost surely, 2^138240001 is an apocalyptic number.

It is an amenable number.

138240001 is a deficient number, since it is larger than the sum of its proper divisors (228351).

138240001 is an equidigital number, since it uses as much as digits as its factorization.

138240001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228350.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 138240001 is about 11757.5508078851. The cubic root of 138240001 is about 517.0643268544.

Adding to 138240001 its reverse (100042831), we get a palindrome (238282832).

The spelling of 138240001 in words is "one hundred thirty-eight million, two hundred forty thousand, one".