1998963 has 6 divisors (see below), whose sum is σ = 2887404. Its totient is φ = 1332636.

The previous prime is 1998961. The next prime is 1998977. The reversal of 1998963 is 3698991.

It is not a de Polignac number, because 1998963 - 2¹ = 1998961 is a prime.

1998963 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1998961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111045 + ... + 111062.

It is an arithmetic number, because the mean of its divisors is an integer number (481234).

2^1998963 is an apocalyptic number.

1998963 is a deficient number, since it is larger than the sum of its proper divisors (888441).

1998963 is a wasteful number, since it uses less digits than its factorization.

1998963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222113 (or 222110 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1998963 is about 1413.8468799697. The cubic root of 1998963 is about 125.9703255894.

The spelling of 1998963 in words is "one million, nine hundred ninety-eight thousand, nine hundred sixty-three".