40115421 has 6 divisors (see below), whose sum is σ = 57944510. Its totient is φ = 26743608.

The previous prime is 40115407. The next prime is 40115423. The reversal of 40115421 is 12451104.

40115421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 39879225 + 236196 = 6315^2 + 486^2 .

It is not a de Polignac number, because 40115421 - 2⁵ = 40115389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40115394 and 40115403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40115423) 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 5 ways as a sum of consecutive naturals, for example, 2228626 + ... + 2228643.

Almost surely, 2^40115421 is an apocalyptic number.

It is an amenable number.

40115421 is a deficient number, since it is larger than the sum of its proper divisors (17829089).

40115421 is a wasteful number, since it uses less digits than its factorization.

40115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457275 (or 4457272 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 40115421 is about 6333.6735785798. The cubic root of 40115421 is about 342.3238186712.

Adding to 40115421 its reverse (12451104), we get a palindrome (52566525).

The spelling of 40115421 in words is "forty million, one hundred fifteen thousand, four hundred twenty-one".