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18155929 = 112181829
BaseRepresentation
bin100010101000…
…0100110011001
31021011102020211
41011100212121
514121442204
61445051121
7310215511
oct105204631
937142224
1018155929
11a280900
1260b6aa1
1339b8c6c
1425a8841
1518d9804
hex1150999

18155929 has 12 divisors (see below), whose sum is σ = 20090980. Its totient is φ = 16394400.

The previous prime is 18155927. The next prime is 18155939. The reversal of 18155929 is 92955181.

It can be written as a sum of positive squares in 2 ways, for example, as 3920400 + 14235529 = 1980^2 + 3773^2 .

It is not a de Polignac number, because 18155929 - 21 = 18155927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18155891 and 18155900.

It is not an unprimeable number, because it can be changed into a prime (18155923) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21487 + ... + 22315.

Almost surely, 218155929 is an apocalyptic number.

It is an amenable number.

18155929 is a deficient number, since it is larger than the sum of its proper divisors (1935051).

18155929 is a wasteful number, since it uses less digits than its factorization.

18155929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1021 counting only the distinct ones).

The product of its digits is 32400, while the sum is 40.

The square root of 18155929 is about 4260.9774700179. The cubic root of 18155929 is about 262.8287231713.

It can be divided in two parts, 1815 and 5929, that added together give a square (7744 = 882).

The spelling of 18155929 in words is "eighteen million, one hundred fifty-five thousand, nine hundred twenty-nine".

Divisors: 1 11 121 181 829 1991 9119 21901 100309 150049 1650539 18155929