1380525866 has 4 divisors (see below), whose sum is σ = 2070788802. Its totient is φ = 690262932.

The previous prime is 1380525841. The next prime is 1380525893. The reversal of 1380525866 is 6685250831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6685250831 = 7 ⋅955035833.

It can be written as a sum of positive squares in only one way, i.e., 1001406025 + 379119841 = 31645^2 + 19471^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345131465 + ... + 345131468.

Almost surely, 2^1380525866 is an apocalyptic number.

1380525866 is a deficient number, since it is larger than the sum of its proper divisors (690262936).

1380525866 is an equidigital number, since it uses as much as digits as its factorization.

1380525866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690262935.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 1380525866 is about 37155.4284862926. The cubic root of 1380525866 is about 1113.4776803969.

The spelling of 1380525866 in words is "one billion, three hundred eighty million, five hundred twenty-five thousand, eight hundred sixty-six".