1218641 has 8 divisors (see below), whose sum is σ = 1324800. Its totient is φ = 1116720.

The previous prime is 1218631. The next prime is 1218649. The reversal of 1218641 is 1468121.

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

It is a cyclic number.

It is not a de Polignac number, because 1218641 - 2¹⁰ = 1217617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218649) 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, 446 + ... + 1623.

It is an arithmetic number, because the mean of its divisors is an integer number (165600).

2^1218641 is an apocalyptic number.

It is an amenable number.

1218641 is a deficient number, since it is larger than the sum of its proper divisors (106159).

1218641 is a wasteful number, since it uses less digits than its factorization.

1218641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119.

The product of its digits is 384, while the sum is 23.

The square root of 1218641 is about 1103.9207399084. The cubic root of 1218641 is about 106.8132825386.

The spelling of 1218641 in words is "one million, two hundred eighteen thousand, six hundred forty-one".