19730409 has 8 divisors (see below), whose sum is σ = 26339040. Its totient is φ = 13137696.

The previous prime is 19730401. The next prime is 19730413. The reversal of 19730409 is 90403791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19730409 - 2³ = 19730401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19730409.

It is not an unprimeable number, because it can be changed into a prime (19730401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699 + ... + 6320.

It is an arithmetic number, because the mean of its divisors is an integer number (3292380).

Almost surely, 2^19730409 is an apocalyptic number.

It is an amenable number.

19730409 is a deficient number, since it is larger than the sum of its proper divisors (6608631).

19730409 is an equidigital number, since it uses as much as digits as its factorization.

19730409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7959.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 19730409 is about 4441.8925020761. The cubic root of 19730409 is about 270.2166025941.

The spelling of 19730409 in words is "nineteen million, seven hundred thirty thousand, four hundred nine".