1993744557 has 32 divisors (see below), whose sum is σ = 3431010560. Its totient is φ = 1120599360.

The previous prime is 1993744553. The next prime is 1993744591. The reversal of 1993744557 is 7554473991.

1993744557 is a `hidden beast` number, since 19 + 9 + 3 + 74 + 4 + 557 = 666.

It is not a de Polignac number, because 1993744557 - 2² = 1993744553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993744553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74938 + ... + 97995.

It is an arithmetic number, because the mean of its divisors is an integer number (107219080).

Almost surely, 2^1993744557 is an apocalyptic number.

It is an amenable number.

1993744557 is a deficient number, since it is larger than the sum of its proper divisors (1437266003).

1993744557 is a wasteful number, since it uses less digits than its factorization.

1993744557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173010 (or 173004 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The square root of 1993744557 is about 44651.3667987890. The cubic root of 1993744557 is about 1258.6061173075.

The spelling of 1993744557 in words is "one billion, nine hundred ninety-three million, seven hundred forty-four thousand, five hundred fifty-seven".