40423429 has 2 divisors, whose sum is σ = 40423430. Its totient is φ = 40423428.

The previous prime is 40423421. The next prime is 40423447. The reversal of 40423429 is 92432404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 859329 = 6290^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 40423429 - 2³ = 40423421 is a prime.

It is a super-2 number, since 2×40423429² = 3268107224236082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40423397 and 40423406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40423421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20211714 + 20211715.

It is an arithmetic number, because the mean of its divisors is an integer number (20211715).

Almost surely, 2^40423429 is an apocalyptic number.

It is an amenable number.

40423429 is a deficient number, since it is larger than the sum of its proper divisors (1).

40423429 is an equidigital number, since it uses as much as digits as its factorization.

40423429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40423429 is about 6357.9421985419. The cubic root of 40423429 is about 343.1977117492.

The spelling of 40423429 in words is "forty million, four hundred twenty-three thousand, four hundred twenty-nine".