400032813 has 16 divisors (see below), whose sum is σ = 564880896. Its totient is φ = 251283120.

The previous prime is 400032811. The next prime is 400032823. The reversal of 400032813 is 318230004.

It is a happy number.

It is not a de Polignac number, because 400032813 - 2¹ = 400032811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400032813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400032811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38643 + ... + 47888.

It is an arithmetic number, because the mean of its divisors is an integer number (35305056).

Almost surely, 2^400032813 is an apocalyptic number.

It is an amenable number.

400032813 is a deficient number, since it is larger than the sum of its proper divisors (164848083).

400032813 is a wasteful number, since it uses less digits than its factorization.

400032813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86624.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 400032813 is about 20000.8203081774. The cubic root of 400032813 is about 736.8264465315.

Adding to 400032813 its reverse (318230004), we get a palindrome (718262817).

The spelling of 400032813 in words is "four hundred million, thirty-two thousand, eight hundred thirteen".