1097740 has 24 divisors (see below), whose sum is σ = 2634912. Its totient is φ = 376320.

The previous prime is 1097729. The next prime is 1097743. The reversal of 1097740 is 477901.

1097740 = 393² + 394² + ... + 399².

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1097699 and 1097708.

It is not an unprimeable number, because it can be changed into a prime (1097743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3781 + ... + 4060.

It is an arithmetic number, because the mean of its divisors is an integer number (109788).

2^1097740 is an apocalyptic number.

1097740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097740 is an abundant number, since it is smaller than the sum of its proper divisors (1537172).

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

1097740 is a wasteful number, since it uses less digits than its factorization.

1097740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857 (or 7855 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 1097740 is about 1047.7308814767. The cubic root of 1097740 is about 103.1572675273.

Multiplying 1097740 by its sum of digits (28), we get a triangular number (30736720 = T₇₈₄₀).

The spelling of 1097740 in words is "one million, ninety-seven thousand, seven hundred forty".