42940823 has 2 divisors, whose sum is σ = 42940824. Its totient is φ = 42940822.

The previous prime is 42940721. The next prime is 42940841. The reversal of 42940823 is 32804924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42940823 - 2⁸ = 42940567 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42940823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42940423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21470411 + 21470412.

It is an arithmetic number, because the mean of its divisors is an integer number (21470412).

Almost surely, 2^42940823 is an apocalyptic number.

42940823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42940823 is an equidigital number, since it uses as much as digits as its factorization.

42940823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 42940823 is about 6552.9247668503. The cubic root of 42940823 is about 350.1790186237.

The spelling of 42940823 in words is "forty-two million, nine hundred forty thousand, eight hundred twenty-three".