1320998085 has 64 divisors (see below), whose sum is σ = 2696832000. Its totient is φ = 606761280.

The previous prime is 1320998069. The next prime is 1320998099. The reversal of 1320998085 is 5808990231.

It is a happy number.

It is not a de Polignac number, because 1320998085 - 2⁴ = 1320998069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1320998085.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4806 + ... + 51624.

It is an arithmetic number, because the mean of its divisors is an integer number (42138000).

Almost surely, 2^1320998085 is an apocalyptic number.

1320998085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320998085 is an abundant number, since it is smaller than the sum of its proper divisors (1375833915).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1320998085 is a wasteful number, since it uses less digits than its factorization.

1320998085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46863 (or 46857 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1320998085 is about 36345.5373464198. The cubic root of 1320998085 is about 1097.2377207883.

The spelling of 1320998085 in words is "one billion, three hundred twenty million, nine hundred ninety-eight thousand, eighty-five".