40520421 has 6 divisors (see below), whose sum is σ = 58529510. Its totient is φ = 27013608.

The previous prime is 40520413. The next prime is 40520429. The reversal of 40520421 is 12402504.

40520421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40520413) and next prime (40520429).

It can be written as a sum of positive squares in only one way, i.e., 24117921 + 16402500 = 4911^2 + 4050^2 .

It is not a de Polignac number, because 40520421 - 2³ = 40520413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40520394 and 40520403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40520429) 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, 2251126 + ... + 2251143.

Almost surely, 2^40520421 is an apocalyptic number.

It is an amenable number.

40520421 is a deficient number, since it is larger than the sum of its proper divisors (18009089).

40520421 is a wasteful number, since it uses less digits than its factorization.

40520421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4502275 (or 4502272 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40520421 is about 6365.5652537697. The cubic root of 40520421 is about 343.4719821036.

Adding to 40520421 its reverse (12402504), we get a palindrome (52922925).

The spelling of 40520421 in words is "forty million, five hundred twenty thousand, four hundred twenty-one".