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213870 = 2357129
BaseRepresentation
bin110100001101101110
3101212101010
4310031232
523320440
64330050
71550346
oct641556
9355333
10213870
11136758
12a3926
1376467
1457d26
1543580
hex3436e

213870 has 16 divisors (see below), whose sum is σ = 513360. Its totient is φ = 57024.

The previous prime is 213859. The next prime is 213881. The reversal of 213870 is 78312.

213870 is nontrivially palindromic in base 13.

213870 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (213859) and next prime (213881).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3535 + ... + 3594.

It is an arithmetic number, because the mean of its divisors is an integer number (32085).

2213870 is an apocalyptic number.

213870 is an abundant number, since it is smaller than the sum of its proper divisors (299490).

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

213870 is a wasteful number, since it uses less digits than its factorization.

213870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 213870 is about 462.4608091504. The cubic root of 213870 is about 59.8021259260.

The spelling of 213870 in words is "two hundred thirteen thousand, eight hundred seventy".

Divisors: 1 2 3 5 6 10 15 30 7129 14258 21387 35645 42774 71290 106935 213870