42821895 has 32 divisors (see below), whose sum is σ = 72914688. Its totient is φ = 21385728.

The previous prime is 42821833. The next prime is 42821897. The reversal of 42821895 is 59812824.

It is not a de Polignac number, because 42821895 - 2⁷ = 42821767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42821897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78012 + ... + 78558.

It is an arithmetic number, because the mean of its divisors is an integer number (2278584).

Almost surely, 2^42821895 is an apocalyptic number.

42821895 is a deficient number, since it is larger than the sum of its proper divisors (30092793).

42821895 is a wasteful number, since it uses less digits than its factorization.

42821895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879.

The product of its digits is 46080, while the sum is 39.

The square root of 42821895 is about 6543.8440537653. The cubic root of 42821895 is about 349.8554368969.

The spelling of 42821895 in words is "forty-two million, eight hundred twenty-one thousand, eight hundred ninety-five".