1097940 has 48 divisors (see below), whose sum is σ = 3185280. Its totient is φ = 282240.

The previous prime is 1097933. The next prime is 1097947. The reversal of 1097940 is 497901.

It is an interprime number because it is at equal distance from previous prime (1097933) and next prime (1097947).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1097898 and 1097907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097947) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1425 + ... + 2055.

It is an arithmetic number, because the mean of its divisors is an integer number (66360).

2^1097940 is an apocalyptic number.

1097940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1097940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1592640).

1097940 is an abundant number, since it is smaller than the sum of its proper divisors (2087340).

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

1097940 is a wasteful number, since it uses less digits than its factorization.

1097940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1097940 is about 1047.8263214865. The cubic root of 1097940 is about 103.1635319738.

The spelling of 1097940 in words is "one million, ninety-seven thousand, nine hundred forty".