42407429 has 2 divisors, whose sum is σ = 42407430. Its totient is φ = 42407428.

The previous prime is 42407419. The next prime is 42407441. The reversal of 42407429 is 92470424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 17656804 = 4975^2 + 4202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42407429 is a prime.

It is equal to p_2570891 and since 42407429 and 2570891 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 42407395 and 42407404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42407419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203714 + 21203715.

It is an arithmetic number, because the mean of its divisors is an integer number (21203715).

Almost surely, 2^42407429 is an apocalyptic number.

It is an amenable number.

42407429 is a deficient number, since it is larger than the sum of its proper divisors (1).

42407429 is an equidigital number, since it uses as much as digits as its factorization.

42407429 is an evil number, because the sum of its binary digits is even.

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

The square root of 42407429 is about 6512.0986632575. The cubic root of 42407429 is about 348.7230447257.

The spelling of 42407429 in words is "forty-two million, four hundred seven thousand, four hundred twenty-nine".