1308142285 has 4 divisors (see below), whose sum is σ = 1569770748. Its totient is φ = 1046513824.

The previous prime is 1308142271. The next prime is 1308142321. The reversal of 1308142285 is 5822418031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5822418031 = 51829 ⋅112339.

It can be written as a sum of positive squares in 2 ways, for example, as 441252036 + 866890249 = 21006^2 + 29443^2 .

It is a cyclic number.

It is not a de Polignac number, because 1308142285 - 2²³ = 1299753677 is a prime.

It is a super-2 number, since 2×1308142285² = 3422472475610042450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1308142285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130814224 + ... + 130814233.

It is an arithmetic number, because the mean of its divisors is an integer number (392442687).

Almost surely, 2^1308142285 is an apocalyptic number.

It is an amenable number.

1308142285 is a deficient number, since it is larger than the sum of its proper divisors (261628463).

1308142285 is an equidigital number, since it uses as much as digits as its factorization.

1308142285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261628462.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 1308142285 is about 36168.2496811776. The cubic root of 1308142285 is about 1093.6667147032. Note that the first 3 decimals are identical.

The spelling of 1308142285 in words is "one billion, three hundred eight million, one hundred forty-two thousand, two hundred eighty-five".