19428679 has 4 divisors (see below), whose sum is σ = 19472400. Its totient is φ = 19384960.

The previous prime is 19428667. The next prime is 19428691. The reversal of 19428679 is 97682491.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (19428667) and next prime (19428691).

It is a cyclic number.

It is not a de Polignac number, because 19428679 - 2⁷ = 19428551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428179) 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, 21187 + ... + 22084.

It is an arithmetic number, because the mean of its divisors is an integer number (4868100).

Almost surely, 2^19428679 is an apocalyptic number.

19428679 is a deficient number, since it is larger than the sum of its proper divisors (43721).

19428679 is an equidigital number, since it uses as much as digits as its factorization.

19428679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43720.

The product of its digits is 217728, while the sum is 46.

The square root of 19428679 is about 4407.7975225729. The cubic root of 19428679 is about 268.8320792021.

The spelling of 19428679 in words is "nineteen million, four hundred twenty-eight thousand, six hundred seventy-nine".