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40109 = 192111
BaseRepresentation
bin1001110010101101
32001000112
421302231
52240414
6505405
7224636
oct116255
961015
1040109
1128153
121b265
1315344
141088d
15bd3e
hex9cad

40109 has 4 divisors (see below), whose sum is σ = 42240. Its totient is φ = 37980.

The previous prime is 40099. The next prime is 40111. The reversal of 40109 is 90104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40109 - 24 = 40093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40093 and 40102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037 + ... + 1074.

It is an arithmetic number, because the mean of its divisors is an integer number (10560).

240109 is an apocalyptic number.

It is an amenable number.

40109 is a deficient number, since it is larger than the sum of its proper divisors (2131).

40109 is a wasteful number, since it uses less digits than its factorization.

40109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 40109 is about 200.2723146119. The cubic root of 40109 is about 34.2305553222.

The spelling of 40109 in words is "forty thousand, one hundred nine".

Divisors: 1 19 2111 40109