Search a number
-
+
12151978 = 218133569
BaseRepresentation
bin101110010110…
…110010101010
3211212101101021
4232112302222
511102330403
61112243054
7205201336
oct56266252
924771337
1012151978
11694aa63
1240a048a
132696227
1418847c6
1511008bd
hexb96caa

12151978 has 8 divisors (see below), whose sum is σ = 18329220. Its totient is φ = 6042240.

The previous prime is 12151973. The next prime is 12151987. The reversal of 12151978 is 87915121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8219689 + 3932289 = 2867^2 + 1983^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12151973) 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 3 ways as a sum of consecutive naturals, for example, 16423 + ... + 17146.

Almost surely, 212151978 is an apocalyptic number.

12151978 is a deficient number, since it is larger than the sum of its proper divisors (6177242).

12151978 is a wasteful number, since it uses less digits than its factorization.

12151978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33752.

The product of its digits is 5040, while the sum is 34.

The square root of 12151978 is about 3485.9687319309. The cubic root of 12151978 is about 229.9053044326.

The spelling of 12151978 in words is "twelve million, one hundred fifty-one thousand, nine hundred seventy-eight".

Divisors: 1 2 181 362 33569 67138 6075989 12151978