1663972 has 6 divisors (see below), whose sum is σ = 2911958. Its totient is φ = 831984.

The previous prime is 1663967. The next prime is 1663973. The reversal of 1663972 is 2793661.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 86436 = 1256^2 + 294^2 .

It is not an unprimeable number, because it can be changed into a prime (1663973) by changing a digit.

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 as a sum of consecutive naturals, namely, 207993 + ... + 208000.

2^1663972 is an apocalyptic number.

It is an amenable number.

1663972 is a deficient number, since it is larger than the sum of its proper divisors (1247986).

1663972 is a wasteful number, since it uses less digits than its factorization.

1663972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415997 (or 415995 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The square root of 1663972 is about 1289.9503866428. The cubic root of 1663972 is about 118.4991780700.

The spelling of 1663972 in words is "one million, six hundred sixty-three thousand, nine hundred seventy-two".