1538738553 has 8 divisors (see below), whose sum is σ = 2238165216. Its totient is φ = 932568800.

The previous prime is 1538738507. The next prime is 1538738563. The reversal of 1538738553 is 3558378351.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1538738553 - 2⁶ = 1538738489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1538738563) 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 7 ways as a sum of consecutive naturals, for example, 23314188 + ... + 23314253.

It is an arithmetic number, because the mean of its divisors is an integer number (279770652).

Almost surely, 2^1538738553 is an apocalyptic number.

It is an amenable number.

1538738553 is a deficient number, since it is larger than the sum of its proper divisors (699426663).

1538738553 is a wasteful number, since it uses less digits than its factorization.

1538738553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46628455.

The product of its digits is 1512000, while the sum is 48.

The square root of 1538738553 is about 39226.7581250350. The cubic root of 1538738553 is about 1154.4849569232.

The spelling of 1538738553 in words is "one billion, five hundred thirty-eight million, seven hundred thirty-eight thousand, five hundred fifty-three".