426007821 has 4 divisors (see below), whose sum is σ = 568010432. Its totient is φ = 284005212.

The previous prime is 426007807. The next prime is 426007823. The reversal of 426007821 is 128700624.

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 426007821 - 2¹⁰ = 426006797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426007823) 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, 71001301 + ... + 71001306.

It is an arithmetic number, because the mean of its divisors is an integer number (142002608).

Almost surely, 2^426007821 is an apocalyptic number.

It is an amenable number.

426007821 is a deficient number, since it is larger than the sum of its proper divisors (142002611).

426007821 is a wasteful number, since it uses less digits than its factorization.

426007821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142002610.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 426007821 is about 20639.9569040248. The cubic root of 426007821 is about 752.4411250355.

The spelling of 426007821 in words is "four hundred twenty-six million, seven thousand, eight hundred twenty-one".