1663696 has 10 divisors (see below), whose sum is σ = 3223442. Its totient is φ = 831840.

The previous prime is 1663693. The next prime is 1663703. The reversal of 1663696 is 6963661.

It can be written as a sum of positive squares in only one way, i.e., 1345600 + 318096 = 1160^2 + 564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51975 + ... + 52006.

2^1663696 is an apocalyptic number.

1663696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1663696 is a deficient number, since it is larger than the sum of its proper divisors (1559746).

1663696 is a wasteful number, since it uses less digits than its factorization.

1663696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103989 (or 103983 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The square root of 1663696 is about 1289.8434013476. The cubic root of 1663696 is about 118.4926259602.

It can be divided in two parts, 166369 and 6, that added together give a cube (166375 = 55³).

The spelling of 1663696 in words is "one million, six hundred sixty-three thousand, six hundred ninety-six".