1993891449 has 24 divisors (see below), whose sum is σ = 2996826336. Its totient is φ = 1169419200.

The previous prime is 1993891439. The next prime is 1993891463. The reversal of 1993891449 is 9441983991.

It is not a de Polignac number, because 1993891449 - 2⁹ = 1993890937 is a prime.

It is a super-2 number, since 2×1993891449² = 7951206220790639202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993891439) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 277 + ... + 63149.

It is an arithmetic number, because the mean of its divisors is an integer number (124867764).

Almost surely, 2^1993891449 is an apocalyptic number.

It is an amenable number.

1993891449 is a deficient number, since it is larger than the sum of its proper divisors (1002934887).

1993891449 is a wasteful number, since it uses less digits than its factorization.

1993891449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62949 (or 62918 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 57.

The square root of 1993891449 is about 44653.0116453527. The cubic root of 1993891449 is about 1258.6370264209.

The spelling of 1993891449 in words is "one billion, nine hundred ninety-three million, eight hundred ninety-one thousand, four hundred forty-nine".