1401663 has 8 divisors (see below), whose sum is σ = 1900800. Its totient is φ = 918488.

The previous prime is 1401641. The next prime is 1401679. The reversal of 1401663 is 3661041.

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

It is a cyclic number.

It is not a de Polignac number, because 1401663 - 2⁹ = 1401151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3783 + ... + 4136.

It is an arithmetic number, because the mean of its divisors is an integer number (237600).

2^1401663 is an apocalyptic number.

1401663 is a deficient number, since it is larger than the sum of its proper divisors (499137).

1401663 is an equidigital number, since it uses as much as digits as its factorization.

1401663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7981.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1401663 is about 1183.9184938162. The cubic root of 1401663 is about 111.9131714361.

The spelling of 1401663 in words is "one million, four hundred one thousand, six hundred sixty-three".