1044865820 has 24 divisors (see below), whose sum is σ = 2225125728. Its totient is φ = 412059200.

The previous prime is 1044865817. The next prime is 1044865837. The reversal of 1044865820 is 285684401.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366491 + ... + 369330.

It is an arithmetic number, because the mean of its divisors is an integer number (92713572).

Almost surely, 2^1044865820 is an apocalyptic number.

1044865820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1044865820 is an abundant number, since it is smaller than the sum of its proper divisors (1180259908).

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

1044865820 is a wasteful number, since it uses less digits than its factorization.

1044865820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735901 (or 735899 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 1044865820 is about 32324.3842942136. The cubic root of 1044865820 is about 1014.7370265204.

The spelling of 1044865820 in words is "one billion, forty-four million, eight hundred sixty-five thousand, eight hundred twenty".