42449021 has 4 divisors (see below), whose sum is σ = 44683200. Its totient is φ = 40214844.

The previous prime is 42449003. The next prime is 42449087. The reversal of 42449021 is 12094424.

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 42449021 - 2⁶ = 42448957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42449521) 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, 1117061 + ... + 1117098.

It is an arithmetic number, because the mean of its divisors is an integer number (11170800).

Almost surely, 2^42449021 is an apocalyptic number.

It is an amenable number.

42449021 is a deficient number, since it is larger than the sum of its proper divisors (2234179).

42449021 is a wasteful number, since it uses less digits than its factorization.

42449021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234178.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 42449021 is about 6515.2913211920. The cubic root of 42449021 is about 348.8370133555.

The spelling of 42449021 in words is "forty-two million, four hundred forty-nine thousand, twenty-one".