1218129 has 8 divisors (see below), whose sum is σ = 1771872. Its totient is φ = 738240.

The previous prime is 1218121. The next prime is 1218131. The reversal of 1218129 is 9218121.

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

It is not a de Polignac number, because 1218129 - 2³ = 1218121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1218099 and 1218108.

It is not an unprimeable number, because it can be changed into a prime (1218121) 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, 18424 + ... + 18489.

It is an arithmetic number, because the mean of its divisors is an integer number (221484).

2^1218129 is an apocalyptic number.

It is an amenable number.

1218129 is a deficient number, since it is larger than the sum of its proper divisors (553743).

1218129 is a wasteful number, since it uses less digits than its factorization.

1218129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36927.

The product of its digits is 288, while the sum is 24.

The square root of 1218129 is about 1103.6888148387. The cubic root of 1218129 is about 106.7983215941.

It can be divided in two parts, 1 and 218129, that added together give a triangular number (218130 = T₆₆₀).

The spelling of 1218129 in words is "one million, two hundred eighteen thousand, one hundred twenty-nine".