18478421946 has 40 divisors (see below), whose sum is σ = 41468423040. Its totient is φ = 6150091752.

The previous prime is 18478421939. The next prime is 18478421953. The reversal of 18478421946 is 64912487481.

It is an interprime number because it is at equal distance from previous prime (18478421939) and next prime (18478421953).

It is a super-2 number, since 2×18478421946² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 18478421892 and 18478421901.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 20215 + ... + 193301.

It is an arithmetic number, because the mean of its divisors is an integer number (1036710576).

Almost surely, 2^18478421946 is an apocalyptic number.

18478421946 is an abundant number, since it is smaller than the sum of its proper divisors (22990001094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18478421946 is a wasteful number, since it uses less digits than its factorization.

18478421946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173760 (or 173751 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 18478421946 in words is "eighteen billion, four hundred seventy-eight million, four hundred twenty-one thousand, nine hundred forty-six".