1538904242 has 6 divisors (see below), whose sum is σ = 2308439583. Its totient is φ = 769424382.

The previous prime is 1538904233. The next prime is 1538904317. The reversal of 1538904242 is 2424098351.

It can be written as a sum of positive squares in only one way, i.e., 769452121 + 769452121 = 27739^2 + 27739^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=27739.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1538904196 and 1538904205.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 41609 + ... + 69347.

Almost surely, 2^1538904242 is an apocalyptic number.

1538904242 is a deficient number, since it is larger than the sum of its proper divisors (769535341).

1538904242 is an frugal number, since it uses more digits than its factorization.

1538904242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55480 (or 27741 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 1538904242 is about 39228.8700066673. The cubic root of 1538904242 is about 1154.5263931573.

The spelling of 1538904242 in words is "one billion, five hundred thirty-eight million, nine hundred four thousand, two hundred forty-two".