19930209 has 32 divisors (see below), whose sum is σ = 29804544. Its totient is φ = 11768640.

The previous prime is 19930201. The next prime is 19930217. The reversal of 19930209 is 90203991.

It is an interprime number because it is at equal distance from previous prime (19930201) and next prime (19930217).

It is not a de Polignac number, because 19930209 - 2³ = 19930201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19930209.

It is not an unprimeable number, because it can be changed into a prime (19930201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152074 + ... + 152204.

It is an arithmetic number, because the mean of its divisors is an integer number (931392).

Almost surely, 2^19930209 is an apocalyptic number.

It is an amenable number.

19930209 is a deficient number, since it is larger than the sum of its proper divisors (9874335).

19930209 is a wasteful number, since it uses less digits than its factorization.

19930209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 19930209 is about 4464.3262649587. The cubic root of 19930209 is about 271.1256571532.

The spelling of 19930209 in words is "nineteen million, nine hundred thirty thousand, two hundred nine".