400203217 has 2 divisors, whose sum is σ = 400203218. Its totient is φ = 400203216.

The previous prime is 400203203. The next prime is 400203253. The reversal of 400203217 is 712302004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400040001 + 163216 = 20001^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 400203217 - 2²³ = 391814609 is a prime.

It is a super-2 number, since 2×400203217² = 320325229794298178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400203194 and 400203203.

It is not a weakly prime, because it can be changed into another prime (400203257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200101608 + 200101609.

It is an arithmetic number, because the mean of its divisors is an integer number (200101609).

Almost surely, 2^400203217 is an apocalyptic number.

It is an amenable number.

400203217 is a deficient number, since it is larger than the sum of its proper divisors (1).

400203217 is an equidigital number, since it uses as much as digits as its factorization.

400203217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 400203217 is about 20005.0797798959. The cubic root of 400203217 is about 736.9310549083.

The spelling of 400203217 in words is "four hundred million, two hundred three thousand, two hundred seventeen".