42155807 has 2 divisors, whose sum is σ = 42155808. Its totient is φ = 42155806.

The previous prime is 42155761. The next prime is 42155809. The reversal of 42155807 is 70855124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42155807 - 2⁸ = 42155551 is a prime.

It is a super-2 number, since 2×42155807² = 3554224127642498, which contains 22 as substring.

Together with 42155809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42155809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077903 + 21077904.

It is an arithmetic number, because the mean of its divisors is an integer number (21077904).

Almost surely, 2^42155807 is an apocalyptic number.

42155807 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155807 is an equidigital number, since it uses as much as digits as its factorization.

42155807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 42155807 is about 6492.7503417273. The cubic root of 42155807 is about 348.0319668305.

The spelling of 42155807 in words is "forty-two million, one hundred fifty-five thousand, eight hundred seven".