490453993 has 4 divisors (see below), whose sum is σ = 490913860. Its totient is φ = 489994128.

The previous prime is 490453987. The next prime is 490454023. The reversal of 490453993 is 399354094.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399354094 = 2 ⋅199677047.

It can be written as a sum of positive squares in 2 ways, for example, as 349390864 + 141063129 = 18692^2 + 11877^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490453993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (490453963) 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, 228330 + ... + 230467.

It is an arithmetic number, because the mean of its divisors is an integer number (122728465).

Almost surely, 2^490453993 is an apocalyptic number.

It is an amenable number.

490453993 is a deficient number, since it is larger than the sum of its proper divisors (459867).

490453993 is a wasteful number, since it uses less digits than its factorization.

490453993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459866.

The product of its (nonzero) digits is 524880, while the sum is 46.

The square root of 490453993 is about 22146.1959035858. The cubic root of 490453993 is about 788.6169214645.

The spelling of 490453993 in words is "four hundred ninety million, four hundred fifty-three thousand, nine hundred ninety-three".