1981422 has 36 divisors (see below), whose sum is σ = 4487496. Its totient is φ = 656100.

The previous prime is 1981417. The next prime is 1981429. The reversal of 1981422 is 2241891.

It is a super-3 number, since 3×1981422³ = 23337385321363090344, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13047 + ... + 13197.

2^1981422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243748).

1981422 is an abundant number, since it is smaller than the sum of its proper divisors (2506074).

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

1981422 is an frugal number, since it uses more digits than its factorization.

1981422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 156 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1981422 is about 1407.6299229556. The cubic root of 1981422 is about 125.6007772411.

The spelling of 1981422 in words is "one million, nine hundred eighty-one thousand, four hundred twenty-two".