426908821 has 2 divisors, whose sum is σ = 426908822. Its totient is φ = 426908820.

The previous prime is 426908809. The next prime is 426908827. The reversal of 426908821 is 128809624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294980625 + 131928196 = 17175^2 + 11486^2 .

It is a cyclic number.

It is not a de Polignac number, because 426908821 - 2¹⁷ = 426777749 is a prime.

It is a super-2 number, since 2×426908821² = 364502282895220082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426908827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213454410 + 213454411.

It is an arithmetic number, because the mean of its divisors is an integer number (213454411).

Almost surely, 2^426908821 is an apocalyptic number.

It is an amenable number.

426908821 is a deficient number, since it is larger than the sum of its proper divisors (1).

426908821 is an equidigital number, since it uses as much as digits as its factorization.

426908821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 426908821 is about 20661.7719714452. The cubic root of 426908821 is about 752.9712186395.

The spelling of 426908821 in words is "four hundred twenty-six million, nine hundred eight thousand, eight hundred twenty-one".