1381866369 has 16 divisors (see below), whose sum is σ = 2100938112. Its totient is φ = 800356608.

The previous prime is 1381866349. The next prime is 1381866377. The reversal of 1381866369 is 9636681831.

It is not a de Polignac number, because 1381866369 - 2⁹ = 1381865857 is a prime.

It is a super-2 number, since 2×1381866369² = 3819109323546488322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1381866319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041469 + ... + 1042794.

It is an arithmetic number, because the mean of its divisors is an integer number (131308632).

Almost surely, 2^1381866369 is an apocalyptic number.

It is an amenable number.

1381866369 is a deficient number, since it is larger than the sum of its proper divisors (719071743).

1381866369 is a wasteful number, since it uses less digits than its factorization.

1381866369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084296.

The product of its digits is 1119744, while the sum is 51.

The square root of 1381866369 is about 37173.4632365616. The cubic root of 1381866369 is about 1113.8379627483.

The spelling of 1381866369 in words is "one billion, three hundred eighty-one million, eight hundred sixty-six thousand, three hundred sixty-nine".