1381785275 has 12 divisors (see below), whose sum is σ = 1845215232. Its totient is φ = 1020395040.

The previous prime is 1381785271. The next prime is 1381785277. The reversal of 1381785275 is 5725871831.

It is a happy number.

It is not a de Polignac number, because 1381785275 - 2² = 1381785271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381785271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2125499 + ... + 2126148.

It is an arithmetic number, because the mean of its divisors is an integer number (153767936).

Almost surely, 2^1381785275 is an apocalyptic number.

1381785275 is a deficient number, since it is larger than the sum of its proper divisors (463429957).

1381785275 is a wasteful number, since it uses less digits than its factorization.

1381785275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251670 (or 4251665 counting only the distinct ones).

The product of its digits is 470400, while the sum is 47.

The square root of 1381785275 is about 37172.3724693488. The cubic root of 1381785275 is about 1113.8161740176.

The spelling of 1381785275 in words is "one billion, three hundred eighty-one million, seven hundred eighty-five thousand, two hundred seventy-five".