40432421 has 4 divisors (see below), whose sum is σ = 40832844. Its totient is φ = 40032000.

The previous prime is 40432397. The next prime is 40432489. The reversal of 40432421 is 12423404.

40432421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 30096196 + 10336225 = 5486^2 + 3215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40432421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40432393 and 40432402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40434421) 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 3 ways as a sum of consecutive naturals, for example, 200060 + ... + 200261.

It is an arithmetic number, because the mean of its divisors is an integer number (10208211).

Almost surely, 2^40432421 is an apocalyptic number.

It is an amenable number.

40432421 is a deficient number, since it is larger than the sum of its proper divisors (400423).

40432421 is a wasteful number, since it uses less digits than its factorization.

40432421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400422.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 40432421 is about 6358.6493062599. The cubic root of 40432421 is about 343.2231574301.

Adding to 40432421 its reverse (12423404), we get a palindrome (52855825).

The spelling of 40432421 in words is "forty million, four hundred thirty-two thousand, four hundred twenty-one".