8428399919 has 4 divisors (see below), whose sum is σ = 8445291000. Its totient is φ = 8411508840.

The previous prime is 8428399913. The next prime is 8428399963. The reversal of 8428399919 is 9199938248.

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

It is a cyclic number.

It is not a de Polignac number, because 8428399919 - 2³² = 4133432623 is a prime.

It is a super-2 number, since 2×8428399919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8428399913) 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, 8444792 + ... + 8445789.

It is an arithmetic number, because the mean of its divisors is an integer number (2111322750).

Almost surely, 2^8428399919 is an apocalyptic number.

8428399919 is a deficient number, since it is larger than the sum of its proper divisors (16891081).

8428399919 is a wasteful number, since it uses less digits than its factorization.

8428399919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16891080.

The product of its digits is 10077696, while the sum is 62.

The square root of 8428399919 is about 91806.3174242383. The cubic root of 8428399919 is about 2035.0810552345.

The spelling of 8428399919 in words is "eight billion, four hundred twenty-eight million, three hundred ninety-nine thousand, nine hundred nineteen".