400001217 has 32 divisors (see below), whose sum is σ = 675861504. Its totient is φ = 204379200.

The previous prime is 400001201. The next prime is 400001227. The reversal of 400001217 is 712100004.

It is not a de Polignac number, because 400001217 - 2⁴ = 400001201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400001196 and 400001205.

It is not an unprimeable number, because it can be changed into a prime (400001227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103 + ... + 28284.

It is an arithmetic number, because the mean of its divisors is an integer number (21120672).

Almost surely, 2^400001217 is an apocalyptic number.

It is an amenable number.

400001217 is a deficient number, since it is larger than the sum of its proper divisors (275860287).

400001217 is a wasteful number, since it uses less digits than its factorization.

400001217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28469.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 400001217 is about 20000.0304249769. The cubic root of 400001217 is about 736.8070469717.

The spelling of 400001217 in words is "four hundred million, one thousand, two hundred seventeen".