426447993 has 4 divisors (see below), whose sum is σ = 568597328. Its totient is φ = 284298660.

The previous prime is 426447979. The next prime is 426448013. The reversal of 426447993 is 399744624.

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 426447993 - 2⁹ = 426447481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (426447943) 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, 71074663 + ... + 71074668.

It is an arithmetic number, because the mean of its divisors is an integer number (142149332).

Almost surely, 2^426447993 is an apocalyptic number.

It is an amenable number.

426447993 is a deficient number, since it is larger than the sum of its proper divisors (142149335).

426447993 is a wasteful number, since it uses less digits than its factorization.

426447993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142149334.

The product of its digits is 1306368, while the sum is 48.

The square root of 426447993 is about 20650.6172546973. The cubic root of 426447993 is about 752.7001887523.

The spelling of 426447993 in words is "four hundred twenty-six million, four hundred forty-seven thousand, nine hundred ninety-three".