1538229923 has 4 divisors (see below), whose sum is σ = 1575747768. Its totient is φ = 1500712080.

The previous prime is 1538229907. The next prime is 1538229941. The reversal of 1538229923 is 3299228351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3299228351 = 31 ⋅106426721.

It is a cyclic number.

It is not a de Polignac number, because 1538229923 - 2⁴ = 1538229907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1538229023) 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, 18758861 + ... + 18758942.

It is an arithmetic number, because the mean of its divisors is an integer number (393936942).

Almost surely, 2^1538229923 is an apocalyptic number.

1538229923 is a deficient number, since it is larger than the sum of its proper divisors (37517845).

1538229923 is an equidigital number, since it uses as much as digits as its factorization.

1538229923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37517844.

The product of its digits is 233280, while the sum is 44.

The square root of 1538229923 is about 39220.2743871075. The cubic root of 1538229923 is about 1154.3577379111.

The spelling of 1538229923 in words is "one billion, five hundred thirty-eight million, two hundred twenty-nine thousand, nine hundred twenty-three".