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42931 = 76133
BaseRepresentation
bin1010011110110011
32011220001
422132303
52333211
6530431
7236110
oct123663
964801
1042931
112a289
1220a17
1316705
1411907
15cac1
hexa7b3

42931 has 4 divisors (see below), whose sum is σ = 49072. Its totient is φ = 36792.

The previous prime is 42929. The next prime is 42937. The reversal of 42931 is 13924.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42931 - 21 = 42929 is a prime.

It is a super-2 number, since 2×429312 = 3686141522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42899 and 42908.

It is not an unprimeable number, because it can be changed into a prime (42937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3060 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (12268).

242931 is an apocalyptic number.

42931 is a deficient number, since it is larger than the sum of its proper divisors (6141).

42931 is an equidigital number, since it uses as much as digits as its factorization.

42931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140.

The product of its digits is 216, while the sum is 19.

The square root of 42931 is about 207.1979729631. The cubic root of 42931 is about 35.0152314658.

The spelling of 42931 in words is "forty-two thousand, nine hundred thirty-one".

Divisors: 1 7 6133 42931