1663831 has 8 divisors (see below), whose sum is σ = 1807344. Its totient is φ = 1522560.

The previous prime is 1663813. The next prime is 1663861. The reversal of 1663831 is 1383661.

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

It is not a de Polignac number, because 1663831 - 2⁷ = 1663703 is a prime.

It is a super-2 number, since 2×1663831² = 5536667193122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663861) 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, 1215 + ... + 2191.

It is an arithmetic number, because the mean of its divisors is an integer number (225918).

2^1663831 is an apocalyptic number.

1663831 is a deficient number, since it is larger than the sum of its proper divisors (143513).

1663831 is a wasteful number, since it uses less digits than its factorization.

1663831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121.

The product of its digits is 2592, while the sum is 28.

The square root of 1663831 is about 1289.8957322202. The cubic root of 1663831 is about 118.4958308870.

It can be divided in two parts, 1663 and 831, that multiplied together give a triangular number (1381953 = T₁₆₆₂).

The spelling of 1663831 in words is "one million, six hundred sixty-three thousand, eight hundred thirty-one".