42807397 has 2 divisors, whose sum is σ = 42807398. Its totient is φ = 42807396.

The previous prime is 42807379. The next prime is 42807473. The reversal of 42807397 is 79370824.

Together with previous prime (42807379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39325441 + 3481956 = 6271^2 + 1866^2 .

It is a cyclic number.

It is not a de Polignac number, because 42807397 - 2⁷ = 42807269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42807307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21403698 + 21403699.

It is an arithmetic number, because the mean of its divisors is an integer number (21403699).

Almost surely, 2^42807397 is an apocalyptic number.

It is an amenable number.

42807397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42807397 is an equidigital number, since it uses as much as digits as its factorization.

42807397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 42807397 is about 6542.7362013152. The cubic root of 42807397 is about 349.8159494909.

The spelling of 42807397 in words is "forty-two million, eight hundred seven thousand, three hundred ninety-seven".