1020044399 has 12 divisors (see below), whose sum is σ = 1122099720. Its totient is φ = 926574000.

The previous prime is 1020044359. The next prime is 1020044401. The reversal of 1020044399 is 9934400201.

It is a happy number.

It is not a de Polignac number, because 1020044399 - 2¹⁶ = 1019978863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020044359) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 199424 + ... + 204474.

It is an arithmetic number, because the mean of its divisors is an integer number (93508310).

Almost surely, 2^1020044399 is an apocalyptic number.

1020044399 is a deficient number, since it is larger than the sum of its proper divisors (102055321).

1020044399 is a wasteful number, since it uses less digits than its factorization.

1020044399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6742 (or 6731 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1020044399 is about 31938.1339310862. The cubic root of 1020044399 is about 1006.6373149174.

The spelling of 1020044399 in words is "one billion, twenty million, forty-four thousand, three hundred ninety-nine".