1981572 has 24 divisors (see below), whose sum is σ = 4749696. Its totient is φ = 642528.

The previous prime is 1981547. The next prime is 1981583. The reversal of 1981572 is 2751891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1788 + ... + 2675.

It is an arithmetic number, because the mean of its divisors is an integer number (197904).

2^1981572 is an apocalyptic number.

1981572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1981572 is an abundant number, since it is smaller than the sum of its proper divisors (2768124).

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

1981572 is a wasteful number, since it uses less digits than its factorization.

1981572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507 (or 4505 counting only the distinct ones).

The product of its digits is 5040, while the sum is 33.

The square root of 1981572 is about 1407.6832029970. The cubic root of 1981572 is about 125.6039466216.

It can be divided in two parts, 198 and 1572, that added together give a triangular number (1770 = T₅₉).

The spelling of 1981572 in words is "one million, nine hundred eighty-one thousand, five hundred seventy-two".