1089640 has 16 divisors (see below), whose sum is σ = 2451780. Its totient is φ = 435840.

The previous prime is 1089629. The next prime is 1089653. The reversal of 1089640 is 469801.

It can be written as a sum of positive squares in 2 ways, for example, as 996004 + 93636 = 998^2 + 306^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1089599 and 1089608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13581 + ... + 13660.

2^1089640 is an apocalyptic number.

1089640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1089640 is an abundant number, since it is smaller than the sum of its proper divisors (1362140).

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

1089640 is a wasteful number, since it uses less digits than its factorization.

1089640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27252 (or 27248 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1089640 is about 1043.8582279218. The cubic root of 1089640 is about 102.9029154008.

The spelling of 1089640 in words is "one million, eighty-nine thousand, six hundred forty".