478642993 has 4 divisors (see below), whose sum is σ = 483116400. Its totient is φ = 474169588.

The previous prime is 478642951. The next prime is 478643059. The reversal of 478642993 is 399246874.

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 a cyclic number.

It is not a de Polignac number, because 478642993 - 2⁹ = 478642481 is a prime.

It is a super-2 number, since 2×478642993² = 458198229495996098, 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 478642993.

It is not an unprimeable number, because it can be changed into a prime (478642943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2236543 + ... + 2236756.

It is an arithmetic number, because the mean of its divisors is an integer number (120779100).

Almost surely, 2^478642993 is an apocalyptic number.

It is an amenable number.

478642993 is a deficient number, since it is larger than the sum of its proper divisors (4473407).

478642993 is a wasteful number, since it uses less digits than its factorization.

478642993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473406.

The product of its digits is 2612736, while the sum is 52.

The square root of 478642993 is about 21877.9110748718. The cubic root of 478642993 is about 782.2349842070.

The spelling of 478642993 in words is "four hundred seventy-eight million, six hundred forty-two thousand, nine hundred ninety-three".