426220397 has 2 divisors, whose sum is σ = 426220398. Its totient is φ = 426220396.

The previous prime is 426220381. The next prime is 426220409. The reversal of 426220397 is 793022624.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297942121 + 128278276 = 17261^2 + 11326^2 .

It is a cyclic number.

It is not a de Polignac number, because 426220397 - 2⁴ = 426220381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426220367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213110198 + 213110199.

It is an arithmetic number, because the mean of its divisors is an integer number (213110199).

Almost surely, 2^426220397 is an apocalyptic number.

It is an amenable number.

426220397 is a deficient number, since it is larger than the sum of its proper divisors (1).

426220397 is an equidigital number, since it uses as much as digits as its factorization.

426220397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 426220397 is about 20645.1058849307. The cubic root of 426220397 is about 752.5662591443.

The spelling of 426220397 in words is "four hundred twenty-six million, two hundred twenty thousand, three hundred ninety-seven".