400000999973 has 2 divisors, whose sum is σ = 400000999974. Its totient is φ = 400000999972.

The previous prime is 400000999967. The next prime is 400001000011. The reversal of 400000999973 is 379999000004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308265917089 + 91735082884 = 555217^2 + 302878^2 .

It is a cyclic number.

It is not a de Polignac number, because 400000999973 - 2¹⁰ = 400000998949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400000998973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000499986 + 200000499987.

It is an arithmetic number, because the mean of its divisors is an integer number (200000499987).

Almost surely, 2^400000999973 is an apocalyptic number.

It is an amenable number.

400000999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

400000999973 is an equidigital number, since it uses as much as digits as its factorization.

400000999973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 50.

Adding to 400000999973 its reverse (379999000004), we get a palindrome (779999999977).

The spelling of 400000999973 in words is "four hundred billion, nine hundred ninety-nine thousand, nine hundred seventy-three".