42826721 has 8 divisors (see below), whose sum is σ = 49042944. Its totient is φ = 36635040.

The previous prime is 42826699. The next prime is 42826733. The reversal of 42826721 is 12762824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42826721 is a prime.

It is a super-2 number, since 2×42826721² = 3668256063223682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42826321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2225 + ... + 9518.

It is an arithmetic number, because the mean of its divisors is an integer number (6130368).

Almost surely, 2^42826721 is an apocalyptic number.

It is an amenable number.

42826721 is a deficient number, since it is larger than the sum of its proper divisors (6216223).

42826721 is a wasteful number, since it uses less digits than its factorization.

42826721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12271.

The product of its digits is 10752, while the sum is 32.

The square root of 42826721 is about 6544.2127868828. The cubic root of 42826721 is about 349.8685792307.

The spelling of 42826721 in words is "forty-two million, eight hundred twenty-six thousand, seven hundred twenty-one".