42807197 has 2 divisors, whose sum is σ = 42807198. Its totient is φ = 42807196.

The previous prime is 42807181. The next prime is 42807203. The reversal of 42807197 is 79170824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38763076 + 4044121 = 6226^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 42807197 - 2⁴ = 42807181 is a prime.

It is a super-2 number, since 2×42807197² = 3664912229993618, which contains 22 as substring.

It is equal to p_2593667 and since 42807197 and 2593667 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42807197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42807137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21403598 + 21403599.

It is an arithmetic number, because the mean of its divisors is an integer number (21403599).

Almost surely, 2^42807197 is an apocalyptic number.

It is an amenable number.

42807197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42807197 is an equidigital number, since it uses as much as digits as its factorization.

42807197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 42807197 is about 6542.7209171720. The cubic root of 42807197 is about 349.8154046996.

The spelling of 42807197 in words is "forty-two million, eight hundred seven thousand, one hundred ninety-seven".