42204397 has 2 divisors, whose sum is σ = 42204398. Its totient is φ = 42204396.

The previous prime is 42204391. The next prime is 42204419. The reversal of 42204397 is 79340224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41332041 + 872356 = 6429^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 42204397 - 2³ = 42204389 is a prime.

It is a super-2 number, since 2×42204397² = 3562422252267218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42204391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21102198 + 21102199.

It is an arithmetic number, because the mean of its divisors is an integer number (21102199).

Almost surely, 2^42204397 is an apocalyptic number.

It is an amenable number.

42204397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42204397 is an equidigital number, since it uses as much as digits as its factorization.

42204397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 42204397 is about 6496.4911298331. The cubic root of 42204397 is about 348.1656327183.

The spelling of 42204397 in words is "forty-two million, two hundred four thousand, three hundred ninety-seven".