40124421 has 6 divisors (see below), whose sum is σ = 57957510. Its totient is φ = 26749608.

The previous prime is 40124419. The next prime is 40124449. The reversal of 40124421 is 12442104.

40124421 is a `hidden beast` number, since 401 + 244 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36180225 + 3944196 = 6015^2 + 1986^2 .

It is not a de Polignac number, because 40124421 - 2¹ = 40124419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40124394 and 40124403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40124401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2229126 + ... + 2229143.

It is an arithmetic number, because the mean of its divisors is an integer number (9659585).

Almost surely, 2^40124421 is an apocalyptic number.

It is an amenable number.

40124421 is a deficient number, since it is larger than the sum of its proper divisors (17833089).

40124421 is a wasteful number, since it uses less digits than its factorization.

40124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4458275 (or 4458272 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 40124421 is about 6334.3840268806. The cubic root of 40124421 is about 342.3494171727.

Adding to 40124421 its reverse (12442104), we get a palindrome (52566525).

The spelling of 40124421 in words is "forty million, one hundred twenty-four thousand, four hundred twenty-one".