1091898 has 12 divisors (see below), whose sum is σ = 2365818. Its totient is φ = 363960.

The previous prime is 1091887. The next prime is 1091917. The reversal of 1091898 is 8981901.

It can be written as a sum of positive squares in only one way, i.e., 1046529 + 45369 = 1023^2 + 213^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30313 + ... + 30348.

2^1091898 is an apocalyptic number.

1091898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1091898 is an abundant number, since it is smaller than the sum of its proper divisors (1273920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091898 is a wasteful number, since it uses less digits than its factorization.

1091898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60669 (or 60666 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1091898 is about 1044.9392326829. The cubic root of 1091898 is about 102.9739463434.

The spelling of 1091898 in words is "one million, ninety-one thousand, eight hundred ninety-eight".