1998465 has 24 divisors (see below), whose sum is σ = 3720960. Its totient is φ = 913248.

The previous prime is 1998457. The next prime is 1998473. The reversal of 1998465 is 5648991.

It is an interprime number because it is at equal distance from previous prime (1998457) and next prime (1998473).

It is not a de Polignac number, because 1998465 - 2³ = 1998457 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 625 + ... + 2094.

It is an arithmetic number, because the mean of its divisors is an integer number (155040).

2^1998465 is an apocalyptic number.

1998465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1998465 is a deficient number, since it is larger than the sum of its proper divisors (1722495).

1998465 is a wasteful number, since it uses less digits than its factorization.

1998465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741 (or 2734 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 1998465 is about 1413.6707537471. The cubic root of 1998465 is about 125.9598637595.

The spelling of 1998465 in words is "one million, nine hundred ninety-eight thousand, four hundred sixty-five".