1097309820 has 48 divisors (see below), whose sum is σ = 3077551008. Its totient is φ = 292131840.

The previous prime is 1097309803. The next prime is 1097309839. The reversal of 1097309820 is 289037901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22200 + ... + 51840.

It is an arithmetic number, because the mean of its divisors is an integer number (64115646).

Almost surely, 2^1097309820 is an apocalyptic number.

1097309820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097309820 is an abundant number, since it is smaller than the sum of its proper divisors (1980241188).

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

1097309820 is a wasteful number, since it uses less digits than its factorization.

1097309820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30270 (or 30268 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1097309820 is about 33125.6670876226. The cubic root of 1097309820 is about 1031.4379075034.

The spelling of 1097309820 in words is "one billion, ninety-seven million, three hundred nine thousand, eight hundred twenty".