400628873 has 2 divisors, whose sum is σ = 400628874. Its totient is φ = 400628872.

The previous prime is 400628861. The next prime is 400628909. The reversal of 400628873 is 378826004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398281849 + 2347024 = 19957^2 + 1532^2 .

It is a cyclic number.

It is not a de Polignac number, because 400628873 - 2⁴ = 400628857 is a prime.

It is equal to p_21367982 and since 400628873 and 21367982 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (400628843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200314436 + 200314437.

It is an arithmetic number, because the mean of its divisors is an integer number (200314437).

Almost surely, 2^400628873 is an apocalyptic number.

It is an amenable number.

400628873 is a deficient number, since it is larger than the sum of its proper divisors (1).

400628873 is an equidigital number, since it uses as much as digits as its factorization.

400628873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 400628873 is about 20015.7156504583. The cubic root of 400628873 is about 737.1922288718.

The spelling of 400628873 in words is "four hundred million, six hundred twenty-eight thousand, eight hundred seventy-three".