1091240 has 16 divisors (see below), whose sum is σ = 2455380. Its totient is φ = 436480.

The previous prime is 1091239. The next prime is 1091243. The reversal of 1091240 is 421901.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 5476 = 1042^2 + 74^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13601 + ... + 13680.

2^1091240 is an apocalyptic number.

1091240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091240 is an abundant number, since it is smaller than the sum of its proper divisors (1364140).

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

1091240 is a wasteful number, since it uses less digits than its factorization.

1091240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27292 (or 27288 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1091240 is about 1044.6243343901. The cubic root of 1091240 is about 102.9532574537.

It can be divided in two parts, 1091 and 240, that added together give a palindrome (1331).

The spelling of 1091240 in words is "one million, ninety-one thousand, two hundred forty".