1981762 has 4 divisors (see below), whose sum is σ = 2972646. Its totient is φ = 990880.

The previous prime is 1981753. The next prime is 1981787. The reversal of 1981762 is 2671891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2671891 = 43 ⋅62137.

It can be written as a sum of positive squares in only one way, i.e., 1929321 + 52441 = 1389^2 + 229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495439 + ... + 495442.

2^1981762 is an apocalyptic number.

1981762 is a deficient number, since it is larger than the sum of its proper divisors (990884).

1981762 is an equidigital number, since it uses as much as digits as its factorization.

1981762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990883.

The product of its digits is 6048, while the sum is 34.

The square root of 1981762 is about 1407.7506881547. The cubic root of 1981762 is about 125.6079609408.

The spelling of 1981762 in words is "one million, nine hundred eighty-one thousand, seven hundred sixty-two".