1538323643 has 4 divisors (see below), whose sum is σ = 1553258928. Its totient is φ = 1523388360.

The previous prime is 1538323637. The next prime is 1538323663. The reversal of 1538323643 is 3463238351.

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

It is a cyclic number.

It is not a de Polignac number, because 1538323643 - 2¹² = 1538319547 is a prime.

It is a super-2 number, since 2×1538323643² = 4732879261225582898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1538323597 and 1538323606.

It is not an unprimeable number, because it can be changed into a prime (1538323603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7467488 + ... + 7467693.

It is an arithmetic number, because the mean of its divisors is an integer number (388314732).

Almost surely, 2^1538323643 is an apocalyptic number.

1538323643 is a deficient number, since it is larger than the sum of its proper divisors (14935285).

1538323643 is a wasteful number, since it uses less digits than its factorization.

1538323643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14935284.

The product of its digits is 155520, while the sum is 38.

The square root of 1538323643 is about 39221.4691591225. The cubic root of 1538323643 is about 1154.3811813527.

The spelling of 1538323643 in words is "one billion, five hundred thirty-eight million, three hundred twenty-three thousand, six hundred forty-three".