1981574 has 16 divisors (see below), whose sum is σ = 3456000. Its totient is φ = 834504.

The previous prime is 1981547. The next prime is 1981583. The reversal of 1981574 is 4751891.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 374 + ... + 2025.

It is an arithmetic number, because the mean of its divisors is an integer number (216000).

2^1981574 is an apocalyptic number.

1981574 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1981574 is a deficient number, since it is larger than the sum of its proper divisors (1474426).

1981574 is a wasteful number, since it uses less digits than its factorization.

1981574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467.

The product of its digits is 10080, while the sum is 35.

The square root of 1981574 is about 1407.6839133840. The cubic root of 1981574 is about 125.6039888790.

The spelling of 1981574 in words is "one million, nine hundred eighty-one thousand, five hundred seventy-four".