1662981 has 8 divisors (see below), whose sum is σ = 2259360. Its totient is φ = 1087632.

The previous prime is 1662979. The next prime is 1663009. The reversal of 1662981 is 1892661.

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

It is not a de Polignac number, because 1662981 - 2¹ = 1662979 is a prime.

It is a super-2 number, since 2×1662981² = 5531011612722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5071 + ... + 5388.

It is an arithmetic number, because the mean of its divisors is an integer number (282420).

2^1662981 is an apocalyptic number.

It is an amenable number.

1662981 is a deficient number, since it is larger than the sum of its proper divisors (596379).

1662981 is a wasteful number, since it uses less digits than its factorization.

1662981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515.

The product of its digits is 5184, while the sum is 33.

The square root of 1662981 is about 1289.5662061329. The cubic root of 1662981 is about 118.4756488267.

The spelling of 1662981 in words is "one million, six hundred sixty-two thousand, nine hundred eighty-one".