1901663 has 8 divisors (see below), whose sum is σ = 2008800. Its totient is φ = 1796608.

The previous prime is 1901651. The next prime is 1901681. The reversal of 1901663 is 3661091.

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 1901663 - 2⁸ = 1901407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901363) 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 7 ways as a sum of consecutive naturals, for example, 1583 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (251100).

2^1901663 is an apocalyptic number.

1901663 is a deficient number, since it is larger than the sum of its proper divisors (107137).

1901663 is an equidigital number, since it uses as much as digits as its factorization.

1901663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1901663 is about 1379.0079767717. The cubic root of 1901663 is about 123.8923580246.

The spelling of 1901663 in words is "one million, nine hundred one thousand, six hundred sixty-three".