400004013 has 4 divisors (see below), whose sum is σ = 533338688. Its totient is φ = 266669340.

The previous prime is 400004009. The next prime is 400004021. The reversal of 400004013 is 310400004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400004013 - 2² = 400004009 is a prime.

It is a super-2 number, since 2×400004013² = 320006420832208338, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400004013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400004083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66667333 + ... + 66667338.

It is an arithmetic number, because the mean of its divisors is an integer number (133334672).

Almost surely, 2^400004013 is an apocalyptic number.

It is an amenable number.

400004013 is a deficient number, since it is larger than the sum of its proper divisors (133334675).

400004013 is a wasteful number, since it uses less digits than its factorization.

400004013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133334674.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 400004013 is about 20000.1003247484. The cubic root of 400004013 is about 736.8087637229.

Adding to 400004013 its reverse (310400004), we get a palindrome (710404017).

The spelling of 400004013 in words is "four hundred million, four thousand, thirteen".