Search a number
-
+
18120805431 = 38372774319
BaseRepresentation
bin10000111000000101…
…011000110000110111
31201202212111021220220
4100320011120300313
5244102411233211
612154035425423
71211023206351
oct207005306067
951685437826
1018120805431
1177597a4363
123618755273
13192a279ca1
14c3c8b60d1
15710cbc806
hex438158c37

18120805431 has 8 divisors (see below), whose sum is σ = 24452171520. Its totient is φ = 11934988152.

The previous prime is 18120805399. The next prime is 18120805447. The reversal of 18120805431 is 13450802181.

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

It is not a de Polignac number, because 18120805431 - 25 = 18120805399 is a prime.

It is a super-2 number, since 2×181208054312 (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18120805392 and 18120805401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120875431) 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, 36386911 + ... + 36387408.

It is an arithmetic number, because the mean of its divisors is an integer number (3056521440).

Almost surely, 218120805431 is an apocalyptic number.

18120805431 is a deficient number, since it is larger than the sum of its proper divisors (6331366089).

18120805431 is an equidigital number, since it uses as much as digits as its factorization.

18120805431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72774405.

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 18120805431 in words is "eighteen billion, one hundred twenty million, eight hundred five thousand, four hundred thirty-one".

Divisors: 1 3 83 249 72774319 218322957 6040268477 18120805431