1381247386 has 8 divisors (see below), whose sum is σ = 2073160404. Its totient is φ = 690193920.

The previous prime is 1381247383. The next prime is 1381247423. The reversal of 1381247386 is 6837421831.

It can be written as a sum of positive squares in 2 ways, for example, as 1367594361 + 13653025 = 36981^2 + 3695^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1381247383) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 210855 + ... + 217306.

Almost surely, 2^1381247386 is an apocalyptic number.

1381247386 is a deficient number, since it is larger than the sum of its proper divisors (691913018).

1381247386 is a wasteful number, since it uses less digits than its factorization.

1381247386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429776.

The product of its digits is 193536, while the sum is 43.

The square root of 1381247386 is about 37165.1367009460. The cubic root of 1381247386 is about 1113.6716297978.

The spelling of 1381247386 in words is "one billion, three hundred eighty-one million, two hundred forty-seven thousand, three hundred eighty-six".