19806469 has 2 divisors, whose sum is σ = 19806470. Its totient is φ = 19806468.

The previous prime is 19806461. The next prime is 19806481. The reversal of 19806469 is 96460891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 3969 = 4450^2 + 63^2 .

It is a cyclic number.

It is not a de Polignac number, because 19806469 - 2³ = 19806461 is a prime.

It is a super-2 number, since 2×19806469² = 784592428495922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19806461) 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, 9903234 + 9903235.

It is an arithmetic number, because the mean of its divisors is an integer number (9903235).

Almost surely, 2^19806469 is an apocalyptic number.

It is an amenable number.

19806469 is a deficient number, since it is larger than the sum of its proper divisors (1).

19806469 is an equidigital number, since it uses as much as digits as its factorization.

19806469 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 19806469 is about 4450.4459327128. The cubic root of 19806469 is about 270.5633823842.

The spelling of 19806469 in words is "nineteen million, eight hundred six thousand, four hundred sixty-nine".