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213240 = 23351777
BaseRepresentation
bin110100000011111000
3101211111210
4310003320
523310430
64323120
71545456
oct640370
9354453
10213240
11136235
12a34a0
13760a1
14579d6
15432b0
hex340f8

213240 has 32 divisors (see below), whose sum is σ = 640080. Its totient is φ = 56832.

The previous prime is 213229. The next prime is 213247. The reversal of 213240 is 42312.

213240 is nontrivially palindromic in base 9.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769 + ... + 1008.

2213240 is an apocalyptic number.

213240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213240 is an abundant number, since it is smaller than the sum of its proper divisors (426840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213240 is a wasteful number, since it uses less digits than its factorization.

213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 213240 is about 461.7791680013. The cubic root of 213240 is about 59.7433481738.

Adding to 213240 its reverse (42312), we get a palindrome (255552).

The spelling of 213240 in words is "two hundred thirteen thousand, two hundred forty".

Divisors: 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 1777 3554 5331 7108 8885 10662 14216 17770 21324 26655 35540 42648 53310 71080 106620 213240