42878723 has 2 divisors, whose sum is σ = 42878724. Its totient is φ = 42878722.

The previous prime is 42878707. The next prime is 42878761. The reversal of 42878723 is 32787824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42878723 - 2⁴ = 42878707 is a prime.

It is a super-2 number, since 2×42878723² = 3677169772221458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42878023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21439361 + 21439362.

It is an arithmetic number, because the mean of its divisors is an integer number (21439362).

Almost surely, 2^42878723 is an apocalyptic number.

42878723 is a deficient number, since it is larger than the sum of its proper divisors (1).

42878723 is an equidigital number, since it uses as much as digits as its factorization.

42878723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528, while the sum is 41.

The square root of 42878723 is about 6548.1847102842. The cubic root of 42878723 is about 350.0101303190.

The spelling of 42878723 in words is "forty-two million, eight hundred seventy-eight thousand, seven hundred twenty-three".