Base | Representation |
---|---|
bin | 111011100010… |
… | …0011010111000 |
3 | 2011201210111221 |
4 | 1313010122320 |
5 | 30442310430 |
6 | 3033001424 |
7 | 526210462 |
oct | 167043270 |
9 | 64653457 |
10 | 31213240 |
11 | 16689a73 |
12 | a553274 |
13 | 660b296 |
14 | 4207132 |
15 | 2b1857a |
hex | 1dc46b8 |
31213240 has 32 divisors (see below), whose sum is σ = 70884000. Its totient is φ = 12369024.
The previous prime is 31213213. The next prime is 31213243. The reversal of 31213240 is 4231213.
It is a happy number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (31213243) 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 7 ways as a sum of consecutive naturals, for example, 781 + ... + 7939.
It is an arithmetic number, because the mean of its divisors is an integer number (2215125).
Almost surely, 231213240 is an apocalyptic number.
It is an amenable number.
31213240 is an abundant number, since it is smaller than the sum of its proper divisors (39670760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31213240 is a wasteful number, since it uses less digits than its factorization.
31213240 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7279 (or 7275 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 16.
The square root of 31213240 is about 5586.8810619164. The cubic root of 31213240 is about 314.8567081538.
Adding to 31213240 its reverse (4231213), we get a palindrome (35444453).
The spelling of 31213240 in words is "thirty-one million, two hundred thirteen thousand, two hundred forty".
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