426609021 has 4 divisors (see below), whose sum is σ = 568812032. Its totient is φ = 284406012.

The previous prime is 426609017. The next prime is 426609041. The reversal of 426609021 is 120906624.

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 426609021 - 2² = 426609017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 426609021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426609041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71101501 + ... + 71101506.

It is an arithmetic number, because the mean of its divisors is an integer number (142203008).

Almost surely, 2^426609021 is an apocalyptic number.

It is an amenable number.

426609021 is a deficient number, since it is larger than the sum of its proper divisors (142203011).

426609021 is a wasteful number, since it uses less digits than its factorization.

426609021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142203010.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 426609021 is about 20654.5157532197. The cubic root of 426609021 is about 752.7949174220.

It can be divided in two parts, 42660 and 9021, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 426609021 in words is "four hundred twenty-six million, six hundred nine thousand, twenty-one".