19406869 has 2 divisors, whose sum is σ = 19406870. Its totient is φ = 19406868.

The previous prime is 19406867. The next prime is 19406921. The reversal of 19406869 is 96860491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 2907025 = 4062^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 19406869 - 2¹ = 19406867 is a prime.

It is a super-2 number, since 2×19406869² = 753253128766322, which contains 22 as substring.

Together with 19406867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19406867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9703434 + 9703435.

It is an arithmetic number, because the mean of its divisors is an integer number (9703435).

Almost surely, 2^19406869 is an apocalyptic number.

It is an amenable number.

19406869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19406869 is an equidigital number, since it uses as much as digits as its factorization.

19406869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 19406869 is about 4405.3228031553. The cubic root of 19406869 is about 268.7314475024.

The spelling of 19406869 in words is "nineteen million, four hundred six thousand, eight hundred sixty-nine".