1538720143 has 4 divisors (see below), whose sum is σ = 1539080080. Its totient is φ = 1538360208.

The previous prime is 1538720137. The next prime is 1538720159. The reversal of 1538720143 is 3410278351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3410278351 = 9539 ⋅357509.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1538720143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1538720099 and 1538720108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538720173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173478 + ... + 182131.

It is an arithmetic number, because the mean of its divisors is an integer number (384770020).

Almost surely, 2^1538720143 is an apocalyptic number.

1538720143 is a deficient number, since it is larger than the sum of its proper divisors (359937).

1538720143 is an equidigital number, since it uses as much as digits as its factorization.

1538720143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359936.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1538720143 is about 39226.5234630855. The cubic root of 1538720143 is about 1154.4803526858.

Adding to 1538720143 its reverse (3410278351), we get a palindrome (4948998494).

The spelling of 1538720143 in words is "one billion, five hundred thirty-eight million, seven hundred twenty thousand, one hundred forty-three".