993649 has 4 divisors (see below), whose sum is σ = 996336. Its totient is φ = 990964.

The previous prime is 993647. The next prime is 993679. The reversal of 993649 is 946399.

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, and also an emirpimes, since its reverse is a distinct semiprime: 946399 = 31 ⋅30529.

It is a cyclic number.

It is not a de Polignac number, because 993649 - 2¹ = 993647 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (249084).

2⁹⁹³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

993649 is a deficient number, since it is larger than the sum of its proper divisors (2687).

993649 is a wasteful number, since it uses less digits than its factorization.

993649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686.

The product of its digits is 52488, while the sum is 40.

The square root of 993649 is about 996.8194420255. The cubic root of 993649 is about 99.7878502431.

The spelling of 993649 in words is "nine hundred ninety-three thousand, six hundred forty-nine".