42294721 has 4 divisors (see below), whose sum is σ = 48336832. Its totient is φ = 36252612.

The previous prime is 42294719. The next prime is 42294727. The reversal of 42294721 is 12749224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42294721 - 2¹ = 42294719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42294727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3021045 + ... + 3021058.

It is an arithmetic number, because the mean of its divisors is an integer number (12084208).

Almost surely, 2^42294721 is an apocalyptic number.

It is an amenable number.

42294721 is a deficient number, since it is larger than the sum of its proper divisors (6042111).

42294721 is an equidigital number, since it uses as much as digits as its factorization.

42294721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042110.

The product of its digits is 8064, while the sum is 31.

The square root of 42294721 is about 6503.4391670869. The cubic root of 42294721 is about 348.4138320146.

The spelling of 42294721 in words is "forty-two million, two hundred ninety-four thousand, seven hundred twenty-one".