1663371 has 12 divisors (see below), whose sum is σ = 2413840. Its totient is φ = 1103760.

The previous prime is 1663351. The next prime is 1663373. The reversal of 1663371 is 1733661.

It is not a de Polignac number, because 1663371 - 2¹⁰ = 1662347 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 3570 + ... + 4008.

2^1663371 is an apocalyptic number.

1663371 is a deficient number, since it is larger than the sum of its proper divisors (750469).

1663371 is a wasteful number, since it uses less digits than its factorization.

1663371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 863 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 1663371 is about 1289.7174109083. The cubic root of 1663371 is about 118.4849096845.

The spelling of 1663371 in words is "one million, six hundred sixty-three thousand, three hundred seventy-one".