1218945 has 64 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 476928.

The previous prime is 1218941. The next prime is 1218949. The reversal of 1218945 is 5498121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1218941) and next prime (1218949).

It is not a de Polignac number, because 1218945 - 2² = 1218941 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25912 + ... + 25958.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2^1218945 is an apocalyptic number.

1218945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1218945 is an abundant number, since it is smaller than the sum of its proper divisors (1361535).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218945 is a wasteful number, since it uses less digits than its factorization.

1218945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94.

The product of its digits is 2880, while the sum is 30.

The square root of 1218945 is about 1104.0584223672. The cubic root of 1218945 is about 106.8221636169.

The spelling of 1218945 in words is "one million, two hundred eighteen thousand, nine hundred forty-five".