42207929 has 2 divisors, whose sum is σ = 42207930. Its totient is φ = 42207928.

The previous prime is 42207899. The next prime is 42207931. The reversal of 42207929 is 92970224.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33327529 + 8880400 = 5773^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 42207929 - 2²⁰ = 41159353 is a prime.

Together with 42207931, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2559491 and since 42207929 and 2559491 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42207959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21103964 + 21103965.

It is an arithmetic number, because the mean of its divisors is an integer number (21103965).

Almost surely, 2^42207929 is an apocalyptic number.

It is an amenable number.

42207929 is a deficient number, since it is larger than the sum of its proper divisors (1).

42207929 is an equidigital number, since it uses as much as digits as its factorization.

42207929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 42207929 is about 6496.7629631994. The cubic root of 42207929 is about 348.1753448715.

The spelling of 42207929 in words is "forty-two million, two hundred seven thousand, nine hundred twenty-nine".