40247429 has 2 divisors, whose sum is σ = 40247430. Its totient is φ = 40247428.

The previous prime is 40247423. The next prime is 40247477. The reversal of 40247429 is 92474204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33616804 + 6630625 = 5798^2 + 2575^2 .

It is a cyclic number.

It is not a de Polignac number, because 40247429 - 2⁴ = 40247413 is a prime.

It is a super-2 number, since 2×40247429² = 3239711082220082, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40247395 and 40247404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40247423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20123714 + 20123715.

It is an arithmetic number, because the mean of its divisors is an integer number (20123715).

Almost surely, 2^40247429 is an apocalyptic number.

It is an amenable number.

40247429 is a deficient number, since it is larger than the sum of its proper divisors (1).

40247429 is an equidigital number, since it uses as much as digits as its factorization.

40247429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 40247429 is about 6344.0861438035. The cubic root of 40247429 is about 342.6989030614.

The spelling of 40247429 in words is "forty million, two hundred forty-seven thousand, four hundred twenty-nine".