1381826505 has 16 divisors (see below), whose sum is σ = 2213112384. Its totient is φ = 736244160.

The previous prime is 1381826503. The next prime is 1381826513. The reversal of 1381826505 is 5056281831.

It is not a de Polignac number, because 1381826505 - 2¹ = 1381826503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381826503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29799 + ... + 60428.

It is an arithmetic number, because the mean of its divisors is an integer number (138319524).

Almost surely, 2^1381826505 is an apocalyptic number.

1381826505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381826505 is a deficient number, since it is larger than the sum of its proper divisors (831285879).

1381826505 is a wasteful number, since it uses less digits than its factorization.

1381826505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91256.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 1381826505 is about 37172.9270437505. The cubic root of 1381826505 is about 1113.8272520012.

The spelling of 1381826505 in words is "one billion, three hundred eighty-one million, eight hundred twenty-six thousand, five hundred five".