42221439 has 48 divisors (see below), whose sum is σ = 71443200. Its totient is φ = 24564384.

The previous prime is 42221437. The next prime is 42221467. The reversal of 42221439 is 93412224.

42221439 is a `hidden beast` number, since 4 + 2 + 221 + 439 = 666.

It is not a de Polignac number, because 42221439 - 2¹ = 42221437 is a prime.

It is a super-2 number, since 2×42221439² = 3565299822461442, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42221437) 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, 86454 + ... + 86940.

It is an arithmetic number, because the mean of its divisors is an integer number (1488400).

Almost surely, 2^42221439 is an apocalyptic number.

42221439 is a deficient number, since it is larger than the sum of its proper divisors (29221761).

42221439 is a wasteful number, since it uses less digits than its factorization.

42221439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 522 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 42221439 is about 6497.8026285814. The cubic root of 42221439 is about 348.2124891336.

The spelling of 42221439 in words is "forty-two million, two hundred twenty-one thousand, four hundred thirty-nine".