1387591066 has 8 divisors (see below), whose sum is σ = 2082356244. Its totient is φ = 693472320.

The previous prime is 1387591013. The next prime is 1387591133. The reversal of 1387591066 is 6601957831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1382278041 + 5313025 = 37179^2 + 2305^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 156205 + ... + 164848.

Almost surely, 2^1387591066 is an apocalyptic number.

1387591066 is a deficient number, since it is larger than the sum of its proper divisors (694765178).

1387591066 is a wasteful number, since it uses less digits than its factorization.

1387591066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323216.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1387591066 is about 37250.3834342682. The cubic root of 1387591066 is about 1115.3739530066.

The spelling of 1387591066 in words is "one billion, three hundred eighty-seven million, five hundred ninety-one thousand, sixty-six".