426221397 has 12 divisors (see below), whose sum is σ = 703603680. Its totient is φ = 243555048.

The previous prime is 426221321. The next prime is 426221429. The reversal of 426221397 is 793122624.

426221397 is a `hidden beast` number, since 4 + 262 + 2 + 1 + 397 = 666.

It is not a de Polignac number, because 426221397 - 2⁷ = 426221269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426221317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3382647 + ... + 3382772.

It is an arithmetic number, because the mean of its divisors is an integer number (58633640).

Almost surely, 2^426221397 is an apocalyptic number.

It is an amenable number.

426221397 is a deficient number, since it is larger than the sum of its proper divisors (277382283).

426221397 is a wasteful number, since it uses less digits than its factorization.

426221397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6765432 (or 6765429 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 426221397 is about 20645.1301037315. The cubic root of 426221397 is about 752.5668477018.

The spelling of 426221397 in words is "four hundred twenty-six million, two hundred twenty-one thousand, three hundred ninety-seven".