18428321397 has 16 divisors (see below), whose sum is σ = 24788017728. Its totient is φ = 12177517440.

The previous prime is 18428321377. The next prime is 18428321437. The reversal of 18428321397 is 79312382481.

It is a happy number.

It is not a de Polignac number, because 18428321397 - 2¹⁰ = 18428320373 is a prime.

It is a super-2 number, since 2×18428321397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428321377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118153 + ... + 225425.

It is an arithmetic number, because the mean of its divisors is an integer number (1549251108).

Almost surely, 2^18428321397 is an apocalyptic number.

It is an amenable number.

18428321397 is a deficient number, since it is larger than the sum of its proper divisors (6359696331).

18428321397 is a wasteful number, since it uses less digits than its factorization.

18428321397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107780.

The product of its digits is 580608, while the sum is 48.

The spelling of 18428321397 in words is "eighteen billion, four hundred twenty-eight million, three hundred twenty-one thousand, three hundred ninety-seven".