493647921 has 24 divisors (see below), whose sum is σ = 813070440. Its totient is φ = 285912576.

The previous prime is 493647901. The next prime is 493647941. The reversal of 493647921 is 129746394.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (493647901) and next prime (493647941).

It can be written as a sum of positive squares in 4 ways, for example, as 8767521 + 484880400 = 2961^2 + 22020^2 .

It is not a de Polignac number, because 493647921 - 2⁹ = 493647409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (493647901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122106 + ... + 126083.

It is an arithmetic number, because the mean of its divisors is an integer number (33877935).

Almost surely, 2^493647921 is an apocalyptic number.

It is an amenable number.

493647921 is a deficient number, since it is larger than the sum of its proper divisors (319422519).

493647921 is a wasteful number, since it uses less digits than its factorization.

493647921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248225 (or 248222 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 493647921 is about 22218.1889676004. The cubic root of 493647921 is about 790.3250923955.

The spelling of 493647921 in words is "four hundred ninety-three million, six hundred forty-seven thousand, nine hundred twenty-one".