1381813635 has 16 divisors (see below), whose sum is σ = 2340955296. Its totient is φ = 693616128.

The previous prime is 1381813603. The next prime is 1381813637. The reversal of 1381813635 is 5363181831.

It is a happy number.

It is not a de Polignac number, because 1381813635 - 2⁵ = 1381813603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381813593 and 1381813602.

It is not an unprimeable number, because it can be changed into a prime (1381813637) 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, 2709184 + ... + 2709693.

It is an arithmetic number, because the mean of its divisors is an integer number (146309706).

Almost surely, 2^1381813635 is an apocalyptic number.

1381813635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1381813635 is a deficient number, since it is larger than the sum of its proper divisors (959141661).

1381813635 is a wasteful number, since it uses less digits than its factorization.

1381813635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5418902.

The product of its digits is 51840, while the sum is 39.

The square root of 1381813635 is about 37172.7539334927. The cubic root of 1381813635 is about 1113.8237940174.

The spelling of 1381813635 in words is "one billion, three hundred eighty-one million, eight hundred thirteen thousand, six hundred thirty-five".