1000445420 has 24 divisors (see below), whose sum is σ = 2262546384. Its totient is φ = 369395136.

The previous prime is 1000445339. The next prime is 1000445443. The reversal of 1000445420 is 245440001.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1000445392 and 1000445401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1923674 + ... + 1924193.

It is an arithmetic number, because the mean of its divisors is an integer number (94272766).

Almost surely, 2^1000445420 is an apocalyptic number.

1000445420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000445420 is an abundant number, since it is smaller than the sum of its proper divisors (1262100964).

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

1000445420 is a wasteful number, since it uses less digits than its factorization.

1000445420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847889 (or 3847887 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1000445420 is about 31629.8185261946. The cubic root of 1000445420 is about 1000.1484512945.

Adding to 1000445420 its reverse (245440001), we get a palindrome (1245885421).

The spelling of 1000445420 in words is "one billion, four hundred forty-five thousand, four hundred twenty".