451998 has 12 divisors (see below), whose sum is σ = 979368. Its totient is φ = 150660.

The previous prime is 451987. The next prime is 452009. The reversal of 451998 is 899154.

It is an interprime number because it is at equal distance from previous prime (451987) and next prime (452009).

It is a congruent number.

It is an unprimeable number.

451998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12538 + ... + 12573.

It is an arithmetic number, because the mean of its divisors is an integer number (81614).

2⁴⁵¹⁹⁹⁸ is an apocalyptic number.

451998 is an abundant number, since it is smaller than the sum of its proper divisors (527370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

451998 is a wasteful number, since it uses less digits than its factorization.

451998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25119 (or 25116 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 451998 is about 672.3079651469. The cubic root of 451998 is about 76.7441895957.

The spelling of 451998 in words is "four hundred fifty-one thousand, nine hundred ninety-eight".