1985355793 has 4 divisors (see below), whose sum is σ = 1985546560. Its totient is φ = 1985165028.

The previous prime is 1985355787. The next prime is 1985355887. The reversal of 1985355793 is 3975535891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1985355793 - 2¹⁷ = 1985224721 is a prime.

It is a super-3 number, since 3×1985355793³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1985355293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78813 + ... + 100906.

It is an arithmetic number, because the mean of its divisors is an integer number (496386640).

Almost surely, 2^1985355793 is an apocalyptic number.

It is an amenable number.

1985355793 is a deficient number, since it is larger than the sum of its proper divisors (190767).

1985355793 is a wasteful number, since it uses less digits than its factorization.

1985355793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190766.

The product of its digits is 5103000, while the sum is 55.

The square root of 1985355793 is about 44557.3315291659. The cubic root of 1985355793 is about 1256.8384230604.

The spelling of 1985355793 in words is "one billion, nine hundred eighty-five million, three hundred fifty-five thousand, seven hundred ninety-three".