1663742 has 8 divisors (see below), whose sum is σ = 2563176. Its totient is φ = 809352.

The previous prime is 1663721. The next prime is 1663747. The reversal of 1663742 is 2473661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663747) by changing a digit.

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, 11168 + ... + 11315.

It is an arithmetic number, because the mean of its divisors is an integer number (320397).

2^1663742 is an apocalyptic number.

1663742 is a deficient number, since it is larger than the sum of its proper divisors (899434).

1663742 is a wasteful number, since it uses less digits than its factorization.

1663742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22522.

The product of its digits is 6048, while the sum is 29.

The square root of 1663742 is about 1289.8612328464. The cubic root of 1663742 is about 118.4937180288.

The spelling of 1663742 in words is "one million, six hundred sixty-three thousand, seven hundred forty-two".