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9999945 = 325359619
BaseRepresentation
bin100110001001…
…011001001001
3200211001100100
4212021121021
510024444240
6554200013
7150666234
oct46113111
920731310
109999945
11571011a
123423009
1320c1837
14148441b
15d27e30
hex989649

9999945 has 24 divisors (see below), whose sum is σ = 17409600. Its totient is φ = 5309856.

The previous prime is 9999943. The next prime is 9999971. The reversal of 9999945 is 5499999.

It is a happy number.

It is not a de Polignac number, because 9999945 - 21 = 9999943 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9999891 and 9999900.

It is not an unprimeable number, because it can be changed into a prime (9999943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15846 + ... + 16464.

It is an arithmetic number, because the mean of its divisors is an integer number (725400).

Almost surely, 29999945 is an apocalyptic number.

It is an amenable number.

9999945 is a deficient number, since it is larger than the sum of its proper divisors (7409655).

9999945 is a wasteful number, since it uses less digits than its factorization.

9999945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989 (or 986 counting only the distinct ones).

The product of its digits is 1180980, while the sum is 54.

The square root of 9999945 is about 3162.2689638929. The cubic root of 9999945 is about 215.4430740228.

The spelling of 9999945 in words is "nine million, nine hundred ninety-nine thousand, nine hundred forty-five".

Divisors: 1 3 5 9 15 45 359 619 1077 1795 1857 3095 3231 5385 5571 9285 16155 27855 222221 666663 1111105 1999989 3333315 9999945