1538731287 has 6 divisors (see below), whose sum is σ = 2222611872. Its totient is φ = 1025820852.

The previous prime is 1538731277. The next prime is 1538731291. The reversal of 1538731287 is 7821378351.

1538731287 is a `hidden beast` number, since 1 + 538 + 7 + 31 + 2 + 87 = 666.

It is not a de Polignac number, because 1538731287 - 2⁸ = 1538731031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538731237) 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 5 ways as a sum of consecutive naturals, for example, 85485063 + ... + 85485080.

It is an arithmetic number, because the mean of its divisors is an integer number (370435312).

Almost surely, 2^1538731287 is an apocalyptic number.

1538731287 is a deficient number, since it is larger than the sum of its proper divisors (683880585).

1538731287 is a wasteful number, since it uses less digits than its factorization.

1538731287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170970149 (or 170970146 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1538731287 is about 39226.6655095740. The cubic root of 1538731287 is about 1154.4831397418.

The spelling of 1538731287 in words is "one billion, five hundred thirty-eight million, seven hundred thirty-one thousand, two hundred eighty-seven".