1538642975 has 12 divisors (see below), whose sum is σ = 1912735464. Its totient is φ = 1227805920.

The previous prime is 1538642969. The next prime is 1538642981. The reversal of 1538642975 is 5792468351.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1538642969) and next prime (1538642981).

It is not a de Polignac number, because 1538642975 - 2¹² = 1538638879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 67589 + ... + 87438.

It is an arithmetic number, because the mean of its divisors is an integer number (159394622).

Almost surely, 2^1538642975 is an apocalyptic number.

1538642975 is a deficient number, since it is larger than the sum of its proper divisors (374092489).

1538642975 is a wasteful number, since it uses less digits than its factorization.

1538642975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155434 (or 155429 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 50.

The square root of 1538642975 is about 39225.5398305747. The cubic root of 1538642975 is about 1154.4610530036.

The spelling of 1538642975 in words is "one billion, five hundred thirty-eight million, six hundred forty-two thousand, nine hundred seventy-five".