400512005 has 8 divisors (see below), whose sum is σ = 481012224. Its totient is φ = 320144400.

The previous prime is 400511981. The next prime is 400512029. The reversal of 400512005 is 500215004.

It is an interprime number because it is at equal distance from previous prime (400511981) and next prime (400512029).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400512005 - 2⁶ = 400511941 is a prime.

It is a super-2 number, since 2×400512005² = 320819732298240050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26381 + ... + 38690.

It is an arithmetic number, because the mean of its divisors is an integer number (60126528).

Almost surely, 2^400512005 is an apocalyptic number.

It is an amenable number.

400512005 is a deficient number, since it is larger than the sum of its proper divisors (80500219).

400512005 is a wasteful number, since it uses less digits than its factorization.

400512005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66307.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 400512005 is about 20012.7960315394. The cubic root of 400512005 is about 737.1205394472.

Adding to 400512005 its reverse (500215004), we get a palindrome (900727009).

The spelling of 400512005 in words is "four hundred million, five hundred twelve thousand, five".