545998 has 4 divisors (see below), whose sum is σ = 819000. Its totient is φ = 272998.

The previous prime is 545959. The next prime is 546001. The reversal of 545998 is 899545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899545 = 5 ⋅179909.

It is a super-2 number, since 2×545998² = 596227632008, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 545998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136498 + ... + 136501.

It is an arithmetic number, because the mean of its divisors is an integer number (204750).

2⁵⁴⁵⁹⁹⁸ is an apocalyptic number.

545998 is a deficient number, since it is larger than the sum of its proper divisors (273002).

545998 is a wasteful number, since it uses less digits than its factorization.

545998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273001.

The product of its digits is 64800, while the sum is 40.

The square root of 545998 is about 738.9167747453. The cubic root of 545998 is about 81.7329204594.

The spelling of 545998 in words is "five hundred forty-five thousand, nine hundred ninety-eight".