1097915720 has 32 divisors (see below), whose sum is σ = 2694885120. Its totient is φ = 399241920.

The previous prime is 1097915717. The next prime is 1097915729. The reversal of 1097915720 is 275197901.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1097915729) 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, 1247192 + ... + 1248071.

It is an arithmetic number, because the mean of its divisors is an integer number (84215160).

Almost surely, 2^1097915720 is an apocalyptic number.

1097915720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097915720 is an abundant number, since it is smaller than the sum of its proper divisors (1596969400).

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

1097915720 is a wasteful number, since it uses less digits than its factorization.

1097915720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495285 (or 2495281 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 1097915720 is about 33134.8113017111. The cubic root of 1097915720 is about 1031.6277151057.

It can be divided in two parts, 109791 and 5720, that added together give a palindrome (115511).

The spelling of 1097915720 in words is "one billion, ninety-seven million, nine hundred fifteen thousand, seven hundred twenty".