42004069 has 2 divisors, whose sum is σ = 42004070. Its totient is φ = 42004068.

The previous prime is 42004013. The next prime is 42004073. The reversal of 42004069 is 96040024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36759969 + 5244100 = 6063^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 42004069 - 2¹⁵ = 41971301 is a prime.

It is a super-2 number, since 2×42004069² = 3528683625113522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42004009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21002034 + 21002035.

It is an arithmetic number, because the mean of its divisors is an integer number (21002035).

Almost surely, 2^42004069 is an apocalyptic number.

It is an amenable number.

42004069 is a deficient number, since it is larger than the sum of its proper divisors (1).

42004069 is an equidigital number, since it uses as much as digits as its factorization.

42004069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42004069 is about 6481.0546209703. The cubic root of 42004069 is about 347.6138894852.

The spelling of 42004069 in words is "forty-two million, four thousand, sixty-nine".