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12811922 = 225312
BaseRepresentation
bin110000110111…
…111010010010
3220002220122122
4300313322102
511234440142
61134334242
7213620354
oct60677222
926086578
1012811922
117260872
12435a382
132867726
1419b70d4
1511d11d2
hexc37e92

12811922 has 6 divisors (see below), whose sum is σ = 19225479. Its totient is φ = 6403430.

The previous prime is 12811907. The next prime is 12811927. The reversal of 12811922 is 22911821.

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 6405961 = 2531^2 + 2531^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=2531.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12811891 and 12811900.

It is not an unprimeable number, because it can be changed into a prime (12811927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3797 + ... + 6327.

Almost surely, 212811922 is an apocalyptic number.

12811922 is a deficient number, since it is larger than the sum of its proper divisors (6413557).

12811922 is an frugal number, since it uses more digits than its factorization.

12811922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064 (or 2533 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 12811922 is about 3579.3745263663. The cubic root of 12811922 is about 233.9940218114.

The spelling of 12811922 in words is "twelve million, eight hundred eleven thousand, nine hundred twenty-two".

Divisors: 1 2 2531 5062 6405961 12811922