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42243997 = 172146173
BaseRepresentation
bin1010000100100…
…1011110011101
32221111012212111
42201021132131
541303301442
64105234021
71022032225
oct241113635
987435774
1042243997
11219335a4
1212192911
1389a1063
145879085
153a96b17
hex284979d

42243997 has 6 divisors (see below), whose sum is σ = 44875418. Its totient is φ = 39758784.

The previous prime is 42243989. The next prime is 42244001. The reversal of 42243997 is 79934224.

42243997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 19766916 + 22477081 = 4446^2 + 4741^2 .

It is not a de Polignac number, because 42243997 - 23 = 42243989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42243937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72798 + ... + 73375.

Almost surely, 242243997 is an apocalyptic number.

It is an amenable number.

42243997 is a deficient number, since it is larger than the sum of its proper divisors (2631421).

42243997 is a wasteful number, since it uses less digits than its factorization.

42243997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146207 (or 146190 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 42243997 is about 6499.5382143657. The cubic root of 42243997 is about 348.2744922219.

The spelling of 42243997 in words is "forty-two million, two hundred forty-three thousand, nine hundred ninety-seven".

Divisors: 1 17 289 146173 2484941 42243997