400805173 has 2 divisors, whose sum is σ = 400805174. Its totient is φ = 400805172.

The previous prime is 400805159. The next prime is 400805219. The reversal of 400805173 is 371508004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329858244 + 70946929 = 18162^2 + 8423^2 .

It is a cyclic number.

It is not a de Polignac number, because 400805173 - 2⁹ = 400804661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400800173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200402586 + 200402587.

It is an arithmetic number, because the mean of its divisors is an integer number (200402587).

Almost surely, 2^400805173 is an apocalyptic number.

It is an amenable number.

400805173 is a deficient number, since it is larger than the sum of its proper divisors (1).

400805173 is an equidigital number, since it uses as much as digits as its factorization.

400805173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 400805173 is about 20020.1192054393. The cubic root of 400805173 is about 737.3003488294.

The spelling of 400805173 in words is "four hundred million, eight hundred five thousand, one hundred seventy-three".