42444081 has 48 divisors (see below), whose sum is σ = 69451200. Its totient is φ = 25800768.

The previous prime is 42444079. The next prime is 42444097. The reversal of 42444081 is 18044424.

It is a happy number.

It is not a de Polignac number, because 42444081 - 2¹ = 42444079 is a prime.

It is a super-2 number, since 2×42444081² = 3603000023869122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (42444001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133735 + ... + 134051.

It is an arithmetic number, because the mean of its divisors is an integer number (1446900).

Almost surely, 2^42444081 is an apocalyptic number.

It is an amenable number.

42444081 is a deficient number, since it is larger than the sum of its proper divisors (27007119).

42444081 is a wasteful number, since it uses less digits than its factorization.

42444081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 42444081 is about 6514.9122020178. The cubic root of 42444081 is about 348.8234808746.

The spelling of 42444081 in words is "forty-two million, four hundred forty-four thousand, eighty-one".