1998435 has 24 divisors (see below), whose sum is σ = 3404016. Its totient is φ = 1000960.

The previous prime is 1998431. The next prime is 1998443. The reversal of 1998435 is 5348991.

It is not a de Polignac number, because 1998435 - 2² = 1998431 is a prime.

Its product of digits (38880) is a multiple of the sum of its prime divisors (486).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1998393 and 1998402.

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 23 ways as a sum of consecutive naturals, for example, 4105 + ... + 4565.

It is an arithmetic number, because the mean of its divisors is an integer number (141834).

2^1998435 is an apocalyptic number.

1998435 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998435 is a deficient number, since it is larger than the sum of its proper divisors (1405581).

1998435 is a wasteful number, since it uses less digits than its factorization.

1998435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 486 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 1998435 is about 1413.6601430330. The cubic root of 1998435 is about 125.9592334733.

The spelling of 1998435 in words is "one million, nine hundred ninety-eight thousand, four hundred thirty-five".