42404443 has 4 divisors (see below), whose sum is σ = 44898840. Its totient is φ = 39910048.

The previous prime is 42404431. The next prime is 42404471. The reversal of 42404443 is 34440424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42404443 - 2²¹ = 40307291 is a prime.

It is a super-2 number, since 2×42404443² = 3596273572280498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42404543) 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, 1247173 + ... + 1247206.

It is an arithmetic number, because the mean of its divisors is an integer number (11224710).

Almost surely, 2^42404443 is an apocalyptic number.

42404443 is a deficient number, since it is larger than the sum of its proper divisors (2494397).

42404443 is a wasteful number, since it uses less digits than its factorization.

42404443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494396.

The product of its (nonzero) digits is 6144, while the sum is 25.

The square root of 42404443 is about 6511.8693936534. The cubic root of 42404443 is about 348.7148597491.

Adding to 42404443 its reverse (34440424), we get a palindrome (76844867).

The spelling of 42404443 in words is "forty-two million, four hundred four thousand, four hundred forty-three".