25782019 has 2 divisors, whose sum is σ = 25782020. Its totient is φ = 25782018.

The previous prime is 25781999. The next prime is 25782023. The reversal of 25782019 is 91028752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25782019 - 2²¹ = 23684867 is a prime.

It is a super-2 number, since 2×25782019² = 1329425007432722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25782059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12891009 + 12891010.

It is an arithmetic number, because the mean of its divisors is an integer number (12891010).

Almost surely, 2^25782019 is an apocalyptic number.

25782019 is a deficient number, since it is larger than the sum of its proper divisors (1).

25782019 is an equidigital number, since it uses as much as digits as its factorization.

25782019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 25782019 is about 5077.5997282180. The cubic root of 25782019 is about 295.4193748029.

The spelling of 25782019 in words is "twenty-five million, seven hundred eighty-two thousand, nineteen".