493408469821 has 4 divisors (see below), whose sum is σ = 494994992544. Its totient is φ = 491821947100.

The previous prime is 493408469737. The next prime is 493408469833. The reversal of 493408469821 is 128964804394.

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 493408469821 - 2¹³ = 493408461629 is a prime.

It is a super-2 number, since 2×493408469821² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493478469821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793260895 + ... + 793261516.

It is an arithmetic number, because the mean of its divisors is an integer number (123748748136).

Almost surely, 2^493408469821 is an apocalyptic number.

It is an amenable number.

493408469821 is a deficient number, since it is larger than the sum of its proper divisors (1586522723).

493408469821 is a wasteful number, since it uses less digits than its factorization.

493408469821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586522722.

The product of its (nonzero) digits is 11943936, while the sum is 58.

The spelling of 493408469821 in words is "four hundred ninety-three billion, four hundred eight million, four hundred sixty-nine thousand, eight hundred twenty-one".