40429021 has 2 divisors, whose sum is σ = 40429022. Its totient is φ = 40429020.

The previous prime is 40429013. The next prime is 40429063. The reversal of 40429021 is 12092404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 5784025 = 5886^2 + 2405^2 .

It is a cyclic number.

It is not a de Polignac number, because 40429021 - 2³ = 40429013 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40428983 and 40429001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40429091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20214510 + 20214511.

It is an arithmetic number, because the mean of its divisors is an integer number (20214511).

Almost surely, 2^40429021 is an apocalyptic number.

It is an amenable number.

40429021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40429021 is an equidigital number, since it uses as much as digits as its factorization.

40429021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40429021 is about 6358.3819482633. The cubic root of 40429021 is about 343.2135365086.

The spelling of 40429021 in words is "forty million, four hundred twenty-nine thousand, twenty-one".