19933409 has 2 divisors, whose sum is σ = 19933410. Its totient is φ = 19933408.

The previous prime is 19933399. The next prime is 19933427. The reversal of 19933409 is 90433991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 819025 = 4372^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 19933409 - 2⁴ = 19933393 is a prime.

It is a super-2 number, since 2×19933409² = 794681588722562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19933429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9966704 + 9966705.

It is an arithmetic number, because the mean of its divisors is an integer number (9966705).

Almost surely, 2^19933409 is an apocalyptic number.

It is an amenable number.

19933409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19933409 is an equidigital number, since it uses as much as digits as its factorization.

19933409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 19933409 is about 4464.6846473183. The cubic root of 19933409 is about 271.1401670475.

The spelling of 19933409 in words is "nineteen million, nine hundred thirty-three thousand, four hundred nine".