1985057365 has 4 divisors (see below), whose sum is σ = 2382068844. Its totient is φ = 1588045888.

The previous prime is 1985057351. The next prime is 1985057387. The reversal of 1985057365 is 5637505891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 832726449 + 1152330916 = 28857^2 + 33946^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985057365 - 2¹⁹ = 1984533077 is a prime.

It is a Duffinian number.

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, 198505732 + ... + 198505741.

It is an arithmetic number, because the mean of its divisors is an integer number (595517211).

Almost surely, 2^1985057365 is an apocalyptic number.

It is an amenable number.

1985057365 is a deficient number, since it is larger than the sum of its proper divisors (397011479).

1985057365 is an equidigital number, since it uses as much as digits as its factorization.

1985057365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397011478.

The product of its (nonzero) digits is 1134000, while the sum is 49.

The square root of 1985057365 is about 44553.9825941520. The cubic root of 1985057365 is about 1256.7754461752.

The spelling of 1985057365 in words is "one billion, nine hundred eighty-five million, fifty-seven thousand, three hundred sixty-five".