493943781 has 4 divisors (see below), whose sum is σ = 658591712. Its totient is φ = 329295852.

The previous prime is 493943771. The next prime is 493943783. The reversal of 493943781 is 187349394.

It is a happy number.

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 not a de Polignac number, because 493943781 - 2²⁷ = 359726053 is a prime.

It is a super-2 number, since 2×493943781² = 487960917577151922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 493943781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493943783) 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 3 ways as a sum of consecutive naturals, for example, 82323961 + ... + 82323966.

It is an arithmetic number, because the mean of its divisors is an integer number (164647928).

Almost surely, 2^493943781 is an apocalyptic number.

It is an amenable number.

493943781 is a deficient number, since it is larger than the sum of its proper divisors (164647931).

493943781 is a wasteful number, since it uses less digits than its factorization.

493943781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164647930.

The product of its digits is 653184, while the sum is 48.

The square root of 493943781 is about 22224.8460287130. The cubic root of 493943781 is about 790.4829504384.

The spelling of 493943781 in words is "four hundred ninety-three million, nine hundred forty-three thousand, seven hundred eighty-one".