1097720 has 32 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 405120.

The previous prime is 1097717. The next prime is 1097729. The reversal of 1097720 is 277901.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1097720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2^1097720 is an apocalyptic number.

1097720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097720 is an abundant number, since it is smaller than the sum of its proper divisors (1563400).

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

1097720 is a wasteful number, since it uses less digits than its factorization.

1097720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 1097720 is about 1047.7213369976. The cubic root of 1097720 is about 103.1566410408.

The spelling of 1097720 in words is "one million, ninety-seven thousand, seven hundred twenty".