1097640 has 48 divisors (see below), whose sum is σ = 3568500. Its totient is φ = 292608.

The previous prime is 1097633. The next prime is 1097651. The reversal of 1097640 is 467901.

1097640 is a `hidden beast` number, since 10 + 9 + 7 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1004004 + 93636 = 1002^2 + 306^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1165 + ... + 1884.

2^1097640 is an apocalyptic number.

1097640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097640 is an abundant number, since it is smaller than the sum of its proper divisors (2470860).

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

1097640 is a wasteful number, since it uses less digits than its factorization.

1097640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066 (or 3059 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1097640 is about 1047.6831582115. The cubic root of 1097640 is about 103.1541350186.

The spelling of 1097640 in words is "one million, ninety-seven thousand, six hundred forty".