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7129139 = 21613299
BaseRepresentation
bin11011001100100000110011
3111102012100012
4123030200303
53311113024
6412445135
7114411443
oct33144063
914365305
107129139
11402a256
1224797ab
131627c34
14d38123
1595c50e
hex6cc833

7129139 has 4 divisors (see below), whose sum is σ = 7134600. Its totient is φ = 7123680.

The previous prime is 7129127. The next prime is 7129159. The reversal of 7129139 is 9319217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9319217 = 10518867.

It is a cyclic number.

It is not a de Polignac number, because 7129139 - 212 = 7125043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7129159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512 + ... + 3810.

It is an arithmetic number, because the mean of its divisors is an integer number (1783650).

Almost surely, 27129139 is an apocalyptic number.

7129139 is a deficient number, since it is larger than the sum of its proper divisors (5461).

7129139 is a wasteful number, since it uses less digits than its factorization.

7129139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460.

The product of its digits is 3402, while the sum is 32.

The square root of 7129139 is about 2670.0447561792. The cubic root of 7129139 is about 192.4623100439.

The spelling of 7129139 in words is "seven million, one hundred twenty-nine thousand, one hundred thirty-nine".

Divisors: 1 2161 3299 7129139