180398 has 4 divisors (see below), whose sum is σ = 270600. Its totient is φ = 90198.

The previous prime is 180391. The next prime is 180413. The reversal of 180398 is 893081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 893081 = 7 ⋅127583.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 180398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45098 + ... + 45101.

It is an arithmetic number, because the mean of its divisors is an integer number (67650).

2¹⁸⁰³⁹⁸ is an apocalyptic number.

180398 is a deficient number, since it is larger than the sum of its proper divisors (90202).

180398 is an equidigital number, since it uses as much as digits as its factorization.

180398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90201.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 180398 is about 424.7328572173. The cubic root of 180398 is about 56.5037458033.

The spelling of 180398 in words is "one hundred eighty thousand, three hundred ninety-eight".