40440413421 has 6 divisors (see below), whose sum is σ = 58413930510. Its totient is φ = 26960275608.

The previous prime is 40440413413. The next prime is 40440413437. The reversal of 40440413421 is 12431404404.

It can be written as a sum of positive squares in only one way, i.e., 40205864196 + 234549225 = 200514^2 + 15315^2 .

It is not a de Polignac number, because 40440413421 - 2³ = 40440413413 is a prime.

It is a super-2 number, since 2×40440413421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440413401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2246689626 + ... + 2246689643.

It is an arithmetic number, because the mean of its divisors is an integer number (9735655085).

Almost surely, 2^40440413421 is an apocalyptic number.

It is an amenable number.

40440413421 is a deficient number, since it is larger than the sum of its proper divisors (17973517089).

40440413421 is a wasteful number, since it uses less digits than its factorization.

40440413421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493379275 (or 4493379272 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 40440413421 its reverse (12431404404), we get a palindrome (52871817825).

The spelling of 40440413421 in words is "forty billion, four hundred forty million, four hundred thirteen thousand, four hundred twenty-one".