1218402 has 48 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 384912.

The previous prime is 1218401. The next prime is 1218421. The reversal of 1218402 is 2048121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1218401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11124 + ... + 11232.

It is an arithmetic number, because the mean of its divisors is an integer number (60060).

2^1218402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441440).

1218402 is an abundant number, since it is smaller than the sum of its proper divisors (1664478).

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

1218402 is a wasteful number, since it uses less digits than its factorization.

1218402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1218402 is about 1103.8124840751. The cubic root of 1218402 is about 106.8062993381.

The spelling of 1218402 in words is "one million, two hundred eighteen thousand, four hundred two".