400641329 has 16 divisors (see below), whose sum is σ = 470629440. Its totient is φ = 336975360.

The previous prime is 400641317. The next prime is 400641343. The reversal of 400641329 is 923146004.

It is not a de Polignac number, because 400641329 - 2²⁴ = 383864113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400641349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7124 + ... + 29189.

It is an arithmetic number, because the mean of its divisors is an integer number (29414340).

Almost surely, 2^400641329 is an apocalyptic number.

It is an amenable number.

400641329 is a deficient number, since it is larger than the sum of its proper divisors (69988111).

400641329 is a wasteful number, since it uses less digits than its factorization.

400641329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36400.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 400641329 is about 20016.0268035392. The cubic root of 400641329 is about 737.1998688364.

The spelling of 400641329 in words is "four hundred million, six hundred forty-one thousand, three hundred twenty-nine".