40002569 has 2 divisors, whose sum is σ = 40002570. Its totient is φ = 40002568.

The previous prime is 40002559. The next prime is 40002577. The reversal of 40002569 is 96520004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 19254544 = 4555^2 + 4388^2 .

It is a cyclic number.

It is not a de Polignac number, because 40002569 - 2¹⁶ = 39937033 is a prime.

It is a super-2 number, since 2×40002569² = 3200411053199522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40002559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20001284 + 20001285.

It is an arithmetic number, because the mean of its divisors is an integer number (20001285).

Almost surely, 2^40002569 is an apocalyptic number.

It is an amenable number.

40002569 is a deficient number, since it is larger than the sum of its proper divisors (1).

40002569 is an equidigital number, since it uses as much as digits as its factorization.

40002569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40002569 is about 6324.7584143586. The cubic root of 40002569 is about 342.0025107256.

The spelling of 40002569 in words is "forty million, two thousand, five hundred sixty-nine".