42004397 has 2 divisors, whose sum is σ = 42004398. Its totient is φ = 42004396.

The previous prime is 42004393. The next prime is 42004409. The reversal of 42004397 is 79340024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34880836 + 7123561 = 5906^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 42004397 - 2² = 42004393 is a prime.

It is a super-3 number, since 3×42004397³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42004393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21002198 + 21002199.

It is an arithmetic number, because the mean of its divisors is an integer number (21002199).

Almost surely, 2^42004397 is an apocalyptic number.

It is an amenable number.

42004397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42004397 is an equidigital number, since it uses as much as digits as its factorization.

42004397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 42004397 is about 6481.0799254445. The cubic root of 42004397 is about 347.6147942949.

The spelling of 42004397 in words is "forty-two million, four thousand, three hundred ninety-seven".