1098899 has 4 divisors (see below), whose sum is σ = 1102320. Its totient is φ = 1095480.

The previous prime is 1098847. The next prime is 1098953. The reversal of 1098899 is 9988901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9988901 = 13 ⋅768377.

It is a cyclic number.

It is not a de Polignac number, because 1098899 - 2¹² = 1094803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1598899) 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, 1172 + ... + 1889.

It is an arithmetic number, because the mean of its divisors is an integer number (275580).

2^1098899 is an apocalyptic number.

1098899 is a deficient number, since it is larger than the sum of its proper divisors (3421).

1098899 is an equidigital number, since it uses as much as digits as its factorization.

1098899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1098899 is about 1048.2838356094. The cubic root of 1098899 is about 103.1935594302.

The spelling of 1098899 in words is "one million, ninety-eight thousand, eight hundred ninety-nine".