400220671 has 2 divisors, whose sum is σ = 400220672. Its totient is φ = 400220670.

The previous prime is 400220663. The next prime is 400220683. The reversal of 400220671 is 176022004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400220671 - 2³ = 400220663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400220071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200110335 + 200110336.

It is an arithmetic number, because the mean of its divisors is an integer number (200110336).

Almost surely, 2^400220671 is an apocalyptic number.

400220671 is a deficient number, since it is larger than the sum of its proper divisors (1).

400220671 is an equidigital number, since it uses as much as digits as its factorization.

400220671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 400220671 is about 20005.5160143396. The cubic root of 400220671 is about 736.9417679720.

Adding to 400220671 its reverse (176022004), we get a palindrome (576242675).

The spelling of 400220671 in words is "four hundred million, two hundred twenty thousand, six hundred seventy-one".