40400004013 has 4 divisors (see below), whose sum is σ = 40401610108. Its totient is φ = 40398397920.

The previous prime is 40400003993. The next prime is 40400004079. The reversal of 40400004013 is 31040000404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38150683684 + 2249320329 = 195322^2 + 47427^2 .

It is a cyclic number.

It is not a de Polignac number, because 40400004013 - 2¹³ = 40399995821 is a prime.

It is a super-2 number, since 2×40400004013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400004713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764706 + ... + 815827.

It is an arithmetic number, because the mean of its divisors is an integer number (10100402527).

Almost surely, 2^40400004013 is an apocalyptic number.

It is an amenable number.

40400004013 is a deficient number, since it is larger than the sum of its proper divisors (1606095).

40400004013 is a wasteful number, since it uses less digits than its factorization.

40400004013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606094.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 40400004013 its reverse (31040000404), we get a palindrome (71440004417).

It can be divided in two parts, 4040000401 and 3, that added together give a palindrome (4040000404).

The spelling of 40400004013 in words is "forty billion, four hundred million, four thousand, thirteen".