1020400442 has 4 divisors (see below), whose sum is σ = 1530600666. Its totient is φ = 510200220.

The previous prime is 1020400417. The next prime is 1020400463. The reversal of 1020400442 is 2440040201.

1020400442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 794168761 + 226231681 = 28181^2 + 15041^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1020400442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255100109 + ... + 255100112.

Almost surely, 2^1020400442 is an apocalyptic number.

1020400442 is a deficient number, since it is larger than the sum of its proper divisors (510200224).

1020400442 is an equidigital number, since it uses as much as digits as its factorization.

1020400442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510200223.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 1020400442 is about 31943.7073928497. The cubic root of 1020400442 is about 1006.7544223942.

Adding to 1020400442 its reverse (2440040201), we get a palindrome (3460440643).

The spelling of 1020400442 in words is "one billion, twenty million, four hundred thousand, four hundred forty-two".