287398 has 4 divisors (see below), whose sum is σ = 431100. Its totient is φ = 143698.

The previous prime is 287393. The next prime is 287437. The reversal of 287398 is 893782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 893782 = 2 ⋅446891.

It is a super-2 number, since 2×287398² = 165195220808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287393) by changing a digit.

287398 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 as a sum of consecutive naturals, namely, 71848 + ... + 71851.

It is an arithmetic number, because the mean of its divisors is an integer number (107775).

2²⁸⁷³⁹⁸ is an apocalyptic number.

287398 is a deficient number, since it is larger than the sum of its proper divisors (143702).

287398 is a wasteful number, since it uses less digits than its factorization.

287398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143701.

The product of its digits is 24192, while the sum is 37.

The square root of 287398 is about 536.0951408099. The cubic root of 287398 is about 65.9924999130.

The spelling of 287398 in words is "two hundred eighty-seven thousand, three hundred ninety-eight".