401433665 has 32 divisors (see below), whose sum is σ = 527192064. Its totient is φ = 292239360.

The previous prime is 401433661. The next prime is 401433679. The reversal of 401433665 is 566334104.

It is not a de Polignac number, because 401433665 - 2² = 401433661 is a prime.

It is a super-2 number, since 2×401433665² = 322297974790664450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401433661) 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, 442142 + ... + 443048.

It is an arithmetic number, because the mean of its divisors is an integer number (16474752).

Almost surely, 2^401433665 is an apocalyptic number.

It is an amenable number.

401433665 is a deficient number, since it is larger than the sum of its proper divisors (125758399).

401433665 is a wasteful number, since it uses less digits than its factorization.

401433665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 401433665 is about 20035.8095668730. The cubic root of 401433665 is about 737.6855279674.

Adding to 401433665 its reverse (566334104), we get a palindrome (967767769).

The spelling of 401433665 in words is "four hundred one million, four hundred thirty-three thousand, six hundred sixty-five".