1098646 has 4 divisors (see below), whose sum is σ = 1647972. Its totient is φ = 549322.

The previous prime is 1098631. The next prime is 1098649. The reversal of 1098646 is 6468901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6468901 = 281 ⋅23021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274660 + ... + 274663.

It is an arithmetic number, because the mean of its divisors is an integer number (411993).

2^1098646 is an apocalyptic number.

1098646 is a deficient number, since it is larger than the sum of its proper divisors (549326).

1098646 is an equidigital number, since it uses as much as digits as its factorization.

1098646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549325.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1098646 is about 1048.1631552387. The cubic root of 1098646 is about 103.1856393895.

The spelling of 1098646 in words is "one million, ninety-eight thousand, six hundred forty-six".