Base | Representation |
---|---|
bin | 1110100010101… |
… | …10100000011100 |
3 | 22111112200122121 |
4 | 13101112200130 |
5 | 222212123043 |
6 | 20034352324 |
7 | 3010614331 |
oct | 721264034 |
9 | 274480577 |
10 | 121989148 |
11 | 62950286 |
12 | 34a2b6a4 |
13 | 1c372438 |
14 | 122b6988 |
15 | aa99ded |
hex | 745681c |
121989148 has 24 divisors (see below), whose sum is σ = 228789792. Its totient is φ = 56764224.
The previous prime is 121989143. The next prime is 121989149. The reversal of 121989148 is 841989121.
It is a happy number.
It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121989143) 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, 14515 + ... + 21322.
It is an arithmetic number, because the mean of its divisors is an integer number (9532908).
Almost surely, 2121989148 is an apocalyptic number.
It is an amenable number.
121989148 is a deficient number, since it is larger than the sum of its proper divisors (106800644).
121989148 is a wasteful number, since it uses less digits than its factorization.
121989148 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 35901 (or 35899 counting only the distinct ones).
The product of its digits is 41472, while the sum is 43.
The square root of 121989148 is about 11044.8697593045. The cubic root of 121989148 is about 495.9528603743.
The spelling of 121989148 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred forty-eight".
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