1091398 has 32 divisors (see below), whose sum is σ = 2154240. Its totient is φ = 401760.

The previous prime is 1091393. The next prime is 1091399. The reversal of 1091398 is 8931901.

It is a super-2 number, since 2×1091398² = 2382299188808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2740 + ... + 3112.

It is an arithmetic number, because the mean of its divisors is an integer number (67320).

2^1091398 is an apocalyptic number.

1091398 is a deficient number, since it is larger than the sum of its proper divisors (1062842).

1091398 is a wasteful number, since it uses less digits than its factorization.

1091398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1091398 is about 1044.6999569254. The cubic root of 1091398 is about 102.9582260612.

It can be divided in two parts, 10913 and 98, that added together give a palindrome (11011).

The spelling of 1091398 in words is "one million, ninety-one thousand, three hundred ninety-eight".