1381223865 has 16 divisors (see below), whose sum is σ = 2525666688. Its totient is φ = 631416576.

The previous prime is 1381223839. The next prime is 1381223873. The reversal of 1381223865 is 5683221831.

It is not a de Polignac number, because 1381223865 - 2⁷ = 1381223737 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 6577152 + ... + 6577361.

It is an arithmetic number, because the mean of its divisors is an integer number (157854168).

Almost surely, 2^1381223865 is an apocalyptic number.

1381223865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381223865 is a deficient number, since it is larger than the sum of its proper divisors (1144442823).

1381223865 is a wasteful number, since it uses less digits than its factorization.

1381223865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13154528.

The product of its digits is 69120, while the sum is 39.

The square root of 1381223865 is about 37164.8202605636. The cubic root of 1381223865 is about 1113.6653082609.

The spelling of 1381223865 in words is "one billion, three hundred eighty-one million, two hundred twenty-three thousand, eight hundred sixty-five".