1098644 has 6 divisors (see below), whose sum is σ = 1922634. Its totient is φ = 549320.

The previous prime is 1098631. The next prime is 1098649. The reversal of 1098644 is 4468901.

It can be written as a sum of positive squares in only one way, i.e., 976144 + 122500 = 988^2 + 350^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1098644.

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, 137327 + ... + 137334.

It is an arithmetic number, because the mean of its divisors is an integer number (320439).

2^1098644 is an apocalyptic number.

It is an amenable number.

1098644 is a deficient number, since it is larger than the sum of its proper divisors (823990).

1098644 is a wasteful number, since it uses less digits than its factorization.

1098644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274665 (or 274663 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1098644 is about 1048.1622011883. The cubic root of 1098644 is about 103.1855767756.

It can be divided in two parts, 10986 and 44, that multiplied together give a palindrome (483384).

The spelling of 1098644 in words is "one million, ninety-eight thousand, six hundred forty-four".