998751 has 8 divisors (see below), whose sum is σ = 1434160. Its totient is φ = 614592.

The previous prime is 998749. The next prime is 998759. The reversal of 998751 is 157899.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 998751 - 2¹ = 998749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 25609 = 998751 / (9 + 9 + 8 + 7 + 5 + 1).

It is an Ulam number.

998751 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12766 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (179270).

2⁹⁹⁸⁷⁵¹ is an apocalyptic number.

998751 is a deficient number, since it is larger than the sum of its proper divisors (435409).

998751 is a wasteful number, since it uses less digits than its factorization.

998751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25625.

The product of its digits is 22680, while the sum is 39.

The square root of 998751 is about 999.3753048780. The cubic root of 998751 is about 99.9583493213.

The spelling of 998751 in words is "nine hundred ninety-eight thousand, seven hundred fifty-one".