40423421 has 2 divisors, whose sum is σ = 40423422. Its totient is φ = 40423420.

The previous prime is 40423387. The next prime is 40423429. The reversal of 40423421 is 12432404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31483321 + 8940100 = 5611^2 + 2990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40423421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40423393 and 40423402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40423429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20211710 + 20211711.

It is an arithmetic number, because the mean of its divisors is an integer number (20211711).

Almost surely, 2^40423421 is an apocalyptic number.

It is an amenable number.

40423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40423421 is an equidigital number, since it uses as much as digits as its factorization.

40423421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 40423421 is about 6357.9415694075. The cubic root of 40423421 is about 343.1976891090.

Adding to 40423421 its reverse (12432404), we get a palindrome (52855825).

The spelling of 40423421 in words is "forty million, four hundred twenty-three thousand, four hundred twenty-one".