1980542 has 8 divisors (see below), whose sum is σ = 2978976. Its totient is φ = 987552.

The previous prime is 1980529. The next prime is 1980577. The reversal of 1980542 is 2450891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1980542² = 7845093227528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 278 + ... + 2009.

It is an arithmetic number, because the mean of its divisors is an integer number (372372).

2^1980542 is an apocalyptic number.

1980542 is a deficient number, since it is larger than the sum of its proper divisors (998434).

1980542 is a wasteful number, since it uses less digits than its factorization.

1980542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1980542 is about 1407.3173060827. The cubic root of 1980542 is about 125.5821803191.

The spelling of 1980542 in words is "one million, nine hundred eighty thousand, five hundred forty-two".