1020400443 has 8 divisors (see below), whose sum is σ = 1511704400. Its totient is φ = 680266944.

The previous prime is 1020400417. The next prime is 1020400463. The reversal of 1020400443 is 3440040201.

It is not a de Polignac number, because 1020400443 - 2⁹ = 1020399931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020400463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18896278 + ... + 18896331.

It is an arithmetic number, because the mean of its divisors is an integer number (188963050).

Almost surely, 2^1020400443 is an apocalyptic number.

1020400443 is a deficient number, since it is larger than the sum of its proper divisors (491303957).

1020400443 is an equidigital number, since it uses as much as digits as its factorization.

1020400443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37792618 (or 37792612 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1020400443 is about 31943.7074085022. The cubic root of 1020400443 is about 1006.7544227231.

Adding to 1020400443 its reverse (3440040201), we get a palindrome (4460440644).

The spelling of 1020400443 in words is "one billion, twenty million, four hundred thousand, four hundred forty-three".