1239540001 has 4 divisors (see below), whose sum is σ = 1416617152. Its totient is φ = 1062462852.

The previous prime is 1239539881. The next prime is 1239540013. The reversal of 1239540001 is 1000459321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1000459321 = 311 ⋅3216911.

It is a cyclic number.

It is not a de Polignac number, because 1239540001 - 2²⁵ = 1205985569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1239540061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88538565 + ... + 88538578.

It is an arithmetic number, because the mean of its divisors is an integer number (354154288).

Almost surely, 2^1239540001 is an apocalyptic number.

It is an amenable number.

1239540001 is a deficient number, since it is larger than the sum of its proper divisors (177077151).

1239540001 is an equidigital number, since it uses as much as digits as its factorization.

1239540001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177077150.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1239540001 is about 35207.1015705639. The cubic root of 1239540001 is about 1074.2042067146.

Adding to 1239540001 its reverse (1000459321), we get a palindrome (2239999322).

The spelling of 1239540001 in words is "one billion, two hundred thirty-nine million, five hundred forty thousand, one".