42256397 has 2 divisors, whose sum is σ = 42256398. Its totient is φ = 42256396.

The previous prime is 42256387. The next prime is 42256421. The reversal of 42256397 is 79365224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30791401 + 11464996 = 5549^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 42256397 - 2⁸ = 42256141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42256397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42256307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21128198 + 21128199.

It is an arithmetic number, because the mean of its divisors is an integer number (21128199).

Almost surely, 2^42256397 is an apocalyptic number.

It is an amenable number.

42256397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42256397 is an equidigital number, since it uses as much as digits as its factorization.

42256397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 42256397 is about 6500.4920582984. The cubic root of 42256397 is about 348.3085655540.

The spelling of 42256397 in words is "forty-two million, two hundred fifty-six thousand, three hundred ninety-seven".