1897663 has 4 divisors (see below), whose sum is σ = 1997560. Its totient is φ = 1797768.

The previous prime is 1897639. The next prime is 1897667. The reversal of 1897663 is 3667981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1897663 - 2¹³ = 1889471 is a prime.

It is a super-2 number, since 2×1897663² = 7202249723138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49920 + ... + 49957.

It is an arithmetic number, because the mean of its divisors is an integer number (499390).

2^1897663 is an apocalyptic number.

1897663 is a deficient number, since it is larger than the sum of its proper divisors (99897).

1897663 is an equidigital number, since it uses as much as digits as its factorization.

1897663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99896.

The product of its digits is 54432, while the sum is 40.

The square root of 1897663 is about 1377.5568953767. The cubic root of 1897663 is about 123.8054310730.

The spelling of 1897663 in words is "one million, eight hundred ninety-seven thousand, six hundred sixty-three".