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71409 = 3131831
BaseRepresentation
bin10001011011110001
310121221210
4101123301
54241114
61310333
7415122
oct213361
9117853
1071409
1149718
12353a9
1326670
141c049
1516259
hex116f1

71409 has 8 divisors (see below), whose sum is σ = 102592. Its totient is φ = 43920.

The previous prime is 71399. The next prime is 71411. The reversal of 71409 is 90417.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71409 - 28 = 71153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71419) 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, 877 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (12824).

271409 is an apocalyptic number.

It is an amenable number.

71409 is a deficient number, since it is larger than the sum of its proper divisors (31183).

71409 is a wasteful number, since it uses less digits than its factorization.

71409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 71409 is about 267.2246246138. The cubic root of 71409 is about 41.4875367810.

The spelling of 71409 in words is "seventy-one thousand, four hundred nine".

Divisors: 1 3 13 39 1831 5493 23803 71409