1663431 has 32 divisors (see below), whose sum is σ = 2918400. Its totient is φ = 816480.

The previous prime is 1663397. The next prime is 1663457. The reversal of 1663431 is 1343661.

It is not a de Polignac number, because 1663431 - 2⁷ = 1663303 is a prime.

It is a super-2 number, since 2×1663431² = 5534005383522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663481) 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 in 31 ways as a sum of consecutive naturals, for example, 4200 + ... + 4578.

It is an arithmetic number, because the mean of its divisors is an integer number (91200).

2^1663431 is an apocalyptic number.

1663431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1663431 is a deficient number, since it is larger than the sum of its proper divisors (1254969).

1663431 is a wasteful number, since it uses less digits than its factorization.

1663431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its digits is 1296, while the sum is 24.

The square root of 1663431 is about 1289.7406716081. The cubic root of 1663431 is about 118.4863343033.

The spelling of 1663431 in words is "one million, six hundred sixty-three thousand, four hundred thirty-one".