1381785287 has 8 divisors (see below), whose sum is σ = 1420166400. Its totient is φ = 1343926584.

The previous prime is 1381785281. The next prime is 1381785337. The reversal of 1381785287 is 7825871831.

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 1381785287 - 2⁴ = 1381785271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381785281) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 125237 + ... + 135822.

It is an arithmetic number, because the mean of its divisors is an integer number (177520800).

Almost surely, 2^1381785287 is an apocalyptic number.

1381785287 is a deficient number, since it is larger than the sum of its proper divisors (38381113).

1381785287 is an equidigital number, since it uses as much as digits as its factorization.

1381785287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261205.

The product of its digits is 752640, while the sum is 50.

The square root of 1381785287 is about 37172.3726307590. The cubic root of 1381785287 is about 1113.8161772419.

The spelling of 1381785287 in words is "one billion, three hundred eighty-one million, seven hundred eighty-five thousand, two hundred eighty-seven".