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42000731 is a prime number
BaseRepresentation
bin1010000000111…
…0000101011011
32221000212011122
42200032011123
541223010411
64100115455
71020000053
oct240160533
987025148
1042000731
1121787853
1212095b8b
138917406
145814563
153a499db
hex280e15b

42000731 has 2 divisors, whose sum is σ = 42000732. Its totient is φ = 42000730.

The previous prime is 42000703. The next prime is 42000779. The reversal of 42000731 is 13700024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42000731 - 214 = 41984347 is a prime.

It is a super-2 number, since 2×420007312 = 3528122809068722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42000701) 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 as a sum of consecutive naturals, namely, 21000365 + 21000366.

It is an arithmetic number, because the mean of its divisors is an integer number (21000366).

Almost surely, 242000731 is an apocalyptic number.

42000731 is a deficient number, since it is larger than the sum of its proper divisors (1).

42000731 is an equidigital number, since it uses as much as digits as its factorization.

42000731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 42000731 is about 6480.7970960369. The cubic root of 42000731 is about 347.6046811241.

Adding to 42000731 its reverse (13700024), we get a palindrome (55700755).

The spelling of 42000731 in words is "forty-two million, seven hundred thirty-one", and thus it is an aban number.