998137 has 4 divisors (see below), whose sum is σ = 1140736. Its totient is φ = 855540.

The previous prime is 998117. The next prime is 998147. The reversal of 998137 is 731899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 998137 - 2⁷ = 998009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 998096 and 998105.

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 3 ways as a sum of consecutive naturals, for example, 71289 + ... + 71302.

It is an arithmetic number, because the mean of its divisors is an integer number (285184).

2⁹⁹⁸¹³⁷ is an apocalyptic number.

It is an amenable number.

998137 is a deficient number, since it is larger than the sum of its proper divisors (142599).

998137 is a wasteful number, since it uses less digits than its factorization.

998137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142598.

The product of its digits is 13608, while the sum is 37.

The square root of 998137 is about 999.0680657493. The cubic root of 998137 is about 99.9378613959.

The spelling of 998137 in words is "nine hundred ninety-eight thousand, one hundred thirty-seven".