1978236 has 48 divisors (see below), whose sum is σ = 5527200. Its totient is φ = 608256.

The previous prime is 1978219. The next prime is 1978267. The reversal of 1978236 is 6328791.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1978236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (115150).

2^1978236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2763600).

1978236 is an abundant number, since it is smaller than the sum of its proper divisors (3548964).

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

1978236 is a wasteful number, since it uses less digits than its factorization.

1978236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435 (or 1427 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1978236 is about 1406.4977781710. The cubic root of 1978236 is about 125.5334217850.

The spelling of 1978236 in words is "one million, nine hundred seventy-eight thousand, two hundred thirty-six".