1663370 has 16 divisors (see below), whose sum is σ = 3067848. Its totient is φ = 648960.

The previous prime is 1663351. The next prime is 1663373. The reversal of 1663370 is 733661.

It can be written as a sum of positive squares in 4 ways, for example, as 908209 + 755161 = 953^2 + 869^2 .

It is not an unprimeable number, because it can be changed into a prime (1663373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1619 + ... + 2438.

2^1663370 is an apocalyptic number.

1663370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663370 is a deficient number, since it is larger than the sum of its proper divisors (1404478).

1663370 is a wasteful number, since it uses less digits than its factorization.

1663370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 1663370 is about 1289.7170232264. The cubic root of 1663370 is about 118.4848859405.

The spelling of 1663370 in words is "one million, six hundred sixty-three thousand, three hundred seventy".