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42442921 = 292236563
BaseRepresentation
bin1010000111101…
…0000010101001
32221212022202001
42201322002221
541331133141
64113411001
71023521203
oct241720251
987768661
1042442921
1121a59aa4
1212269a61
138a40771
1458cb773
153ad5a31
hex287a0a9

42442921 has 8 divisors (see below), whose sum is σ = 44110080. Its totient is φ = 40789392.

The previous prime is 42442891. The next prime is 42442949. The reversal of 42442921 is 12924424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42442921 - 27 = 42442793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42442921.

It is not an unprimeable number, because it can be changed into a prime (42442951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3186 + ... + 9748.

It is an arithmetic number, because the mean of its divisors is an integer number (5513760).

Almost surely, 242442921 is an apocalyptic number.

It is an amenable number.

42442921 is a deficient number, since it is larger than the sum of its proper divisors (1667159).

42442921 is a wasteful number, since it uses less digits than its factorization.

42442921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6815.

The product of its digits is 4608, while the sum is 28.

The square root of 42442921 is about 6514.8231748836. The cubic root of 42442921 is about 348.8203030548.

The spelling of 42442921 in words is "forty-two million, four hundred forty-two thousand, nine hundred twenty-one".

Divisors: 1 29 223 6467 6563 190327 1463549 42442921