1998437 has 8 divisors (see below), whose sum is σ = 2316672. Its totient is φ = 1688400.

The previous prime is 1998431. The next prime is 1998443. The reversal of 1998437 is 7348991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1998431) and next prime (1998443).

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

It is not a de Polignac number, because 1998437 - 2⁸ = 1998181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1998394 and 1998403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998431) 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, 1514 + ... + 2507.

It is an arithmetic number, because the mean of its divisors is an integer number (289584).

2^1998437 is an apocalyptic number.

It is an amenable number.

1998437 is a deficient number, since it is larger than the sum of its proper divisors (318235).

1998437 is an equidigital number, since it uses as much as digits as its factorization.

1998437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099.

The product of its digits is 54432, while the sum is 41.

The square root of 1998437 is about 1413.6608504164. The cubic root of 1998437 is about 125.9592754926.

The spelling of 1998437 in words is "one million, nine hundred ninety-eight thousand, four hundred thirty-seven".