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13870 = 251973
BaseRepresentation
bin11011000101110
3201000201
43120232
5420440
6144114
755303
oct33056
921021
1013870
11a46a
12803a
13640c
1450aa
15419a
hex362e

13870 has 16 divisors (see below), whose sum is σ = 26640. Its totient is φ = 5184.

The previous prime is 13859. The next prime is 13873. The reversal of 13870 is 7831.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13873) 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, 154 + ... + 226.

It is an arithmetic number, because the mean of its divisors is an integer number (1665).

213870 is an apocalyptic number.

13870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13870 is a deficient number, since it is larger than the sum of its proper divisors (12770).

13870 is a wasteful number, since it uses less digits than its factorization.

13870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 13870 is about 117.7709641635. The cubic root of 13870 is about 24.0265908980.

The spelling of 13870 in words is "thirteen thousand, eight hundred seventy".

Divisors: 1 2 5 10 19 38 73 95 146 190 365 730 1387 2774 6935 13870