1981236 has 12 divisors (see below), whose sum is σ = 4622912. Its totient is φ = 660408.

The previous prime is 1981201. The next prime is 1981237. The reversal of 1981236 is 6321891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×1981236³ = 23330813758807416768, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82540 + ... + 82563.

2^1981236 is an apocalyptic number.

It is an amenable number.

1981236 is an abundant number, since it is smaller than the sum of its proper divisors (2641676).

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

1981236 is a wasteful number, since it uses less digits than its factorization.

1981236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165110 (or 165108 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 1981236 is about 1407.5638529033. The cubic root of 1981236 is about 125.5968469870.

The spelling of 1981236 in words is "one million, nine hundred eighty-one thousand, two hundred thirty-six".