998157 has 8 divisors (see below), whose sum is σ = 1336384. Its totient is φ = 662688.

The previous prime is 998147. The next prime is 998161. The reversal of 998157 is 751899.

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 998157 - 2⁷ = 998029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998117) 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, 408 + ... + 1470.

It is an arithmetic number, because the mean of its divisors is an integer number (167048).

2⁹⁹⁸¹⁵⁷ is an apocalyptic number.

It is an amenable number.

998157 is a deficient number, since it is larger than the sum of its proper divisors (338227).

998157 is a wasteful number, since it uses less digits than its factorization.

998157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379.

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

The square root of 998157 is about 999.0780750272. The cubic root of 998157 is about 99.9385288874.

It can be divided in two parts, 99 and 8157, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 998157 in words is "nine hundred ninety-eight thousand, one hundred fifty-seven".