19413409 has 4 divisors (see below), whose sum is σ = 20039680. Its totient is φ = 18787140.

The previous prime is 19413389. The next prime is 19413467. The reversal of 19413409 is 90431491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19413409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 626239 = 19413409 / (1 + 9 + 4 + 1 + 3 + 4 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19413509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313089 + ... + 313150.

It is an arithmetic number, because the mean of its divisors is an integer number (5009920).

Almost surely, 2^19413409 is an apocalyptic number.

It is an amenable number.

19413409 is a deficient number, since it is larger than the sum of its proper divisors (626271).

19413409 is an equidigital number, since it uses as much as digits as its factorization.

19413409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626270.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 19413409 is about 4406.0650244861. The cubic root of 19413409 is about 268.7616310813.

The spelling of 19413409 in words is "nineteen million, four hundred thirteen thousand, four hundred nine".