1098945 has 12 divisors (see below), whose sum is σ = 1904916. Its totient is φ = 586080.

The previous prime is 1098847. The next prime is 1098953. The reversal of 1098945 is 5498901.

1098945 = T₅₄ + T₅₅ + ... + T₁₈₈.

1098945 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 986049 = 336^2 + 993^2 .

It is not a de Polignac number, because 1098945 - 2⁸ = 1098689 is a prime.

It is a super-2 number, since 2×1098945² = 2415360226050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12166 + ... + 12255.

It is an arithmetic number, because the mean of its divisors is an integer number (158743).

2^1098945 is an apocalyptic number.

1098945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1098945 is a deficient number, since it is larger than the sum of its proper divisors (805971).

1098945 is a wasteful number, since it uses less digits than its factorization.

1098945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24432 (or 24429 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1098945 is about 1048.3057760024. The cubic root of 1098945 is about 103.1949993070.

The spelling of 1098945 in words is "one million, ninety-eight thousand, nine hundred forty-five".