1981274 has 4 divisors (see below), whose sum is σ = 2971914. Its totient is φ = 990636.

The previous prime is 1981267. The next prime is 1981277. The reversal of 1981274 is 4721891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 889249 = 1045^2 + 943^2 .

It is a super-3 number, since 3×1981274³ = 23332156235817716472, which contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1981274.

It is not an unprimeable number, because it can be changed into a prime (1981277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495317 + ... + 495320.

2^1981274 is an apocalyptic number.

1981274 is a deficient number, since it is larger than the sum of its proper divisors (990640).

1981274 is an equidigital number, since it uses as much as digits as its factorization.

1981274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990639.

The product of its digits is 4032, while the sum is 32.

The square root of 1981274 is about 1407.5773513381. The cubic root of 1981274 is about 125.5976499621.

It can be divided in two parts, 198 and 1274, that multiplied together give a palindrome (252252).

The spelling of 1981274 in words is "one million, nine hundred eighty-one thousand, two hundred seventy-four".