493983781 has 4 divisors (see below), whose sum is σ = 507334732. Its totient is φ = 480632832.

The previous prime is 493983769. The next prime is 493983817. The reversal of 493983781 is 187389394.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 348419556 + 145564225 = 18666^2 + 12065^2 .

It is a cyclic number.

It is not a de Polignac number, because 493983781 - 2⁷ = 493983653 is a prime.

It is a super-2 number, since 2×493983781² = 488039951782111922, which 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 (493983751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6675420 + ... + 6675493.

It is an arithmetic number, because the mean of its divisors is an integer number (126833683).

Almost surely, 2^493983781 is an apocalyptic number.

It is an amenable number.

493983781 is a deficient number, since it is larger than the sum of its proper divisors (13350951).

493983781 is a wasteful number, since it uses less digits than its factorization.

493983781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13350950.

The product of its digits is 1306368, while the sum is 52.

The square root of 493983781 is about 22225.7459042436. The cubic root of 493983781 is about 790.5042878630.

The spelling of 493983781 in words is "four hundred ninety-three million, nine hundred eighty-three thousand, seven hundred eighty-one".