Base | Representation |
---|---|
bin | 111100110010… |
… | …0100100111000 |
3 | 2012222010101020 |
4 | 1321210210320 |
5 | 31124303430 |
6 | 3055022440 |
7 | 534612144 |
oct | 171444470 |
9 | 65863336 |
10 | 31869240 |
11 | 16a97917 |
12 | a80aa20 |
13 | 67aaa50 |
14 | 4338224 |
15 | 2be7b10 |
hex | 1e64938 |
31869240 has 128 divisors (see below), whose sum is σ = 106444800. Its totient is φ = 7580160.
The previous prime is 31869239. The next prime is 31869269. The reversal of 31869240 is 4296813.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48031 + ... + 48689.
It is an arithmetic number, because the mean of its divisors is an integer number (831600).
Almost surely, 231869240 is an apocalyptic number.
31869240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31869240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53222400).
31869240 is an abundant number, since it is smaller than the sum of its proper divisors (74575560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31869240 is a wasteful number, since it uses less digits than its factorization.
31869240 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 717 (or 713 counting only the distinct ones).
The product of its (nonzero) digits is 10368, while the sum is 33.
The square root of 31869240 is about 5645.2847580968. The cubic root of 31869240 is about 317.0471855378.
The spelling of 31869240 in words is "thirty-one million, eight hundred sixty-nine thousand, two hundred forty".
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