426339905 has 16 divisors (see below), whose sum is σ = 515970000. Its totient is φ = 338178048.

The previous prime is 426339899. The next prime is 426339967. The reversal of 426339905 is 509933624.

It is a Cunningham number, because it is equal to 20648²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 426339904 = 1^2 + 20648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426339905 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340721 + ... + 341969.

It is an arithmetic number, because the mean of its divisors is an integer number (32248125).

Almost surely, 2^426339905 is an apocalyptic number.

It is an amenable number.

426339905 is a deficient number, since it is larger than the sum of its proper divisors (89630095).

426339905 is a wasteful number, since it uses less digits than its factorization.

426339905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 426339905 is about 20648.0000242154. Note that the first 4 decimals coincide. The cubic root of 426339905 is about 752.6365899595.

The spelling of 426339905 in words is "four hundred twenty-six million, three hundred thirty-nine thousand, nine hundred five".