1381820285 has 8 divisors (see below), whose sum is σ = 1680899640. Its totient is φ = 1090312704.

The previous prime is 1381820273. The next prime is 1381820303. The reversal of 1381820285 is 5820281831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44382244 + 1337438041 = 6662^2 + 36571^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1381820285 - 2¹⁸ = 1381558141 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1892540 + ... + 1893269.

It is an arithmetic number, because the mean of its divisors is an integer number (210112455).

Almost surely, 2^1381820285 is an apocalyptic number.

It is an amenable number.

1381820285 is a deficient number, since it is larger than the sum of its proper divisors (299079355).

1381820285 is an equidigital number, since it uses as much as digits as its factorization.

1381820285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785887.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 1381820285 is about 37172.8433806186. The cubic root of 1381820285 is about 1113.8255807794.

The spelling of 1381820285 in words is "one billion, three hundred eighty-one million, eight hundred twenty thousand, two hundred eighty-five".