1097818220 has 24 divisors (see below), whose sum is σ = 2343214608. Its totient is φ = 431928000.

The previous prime is 1097818219. The next prime is 1097818223. The reversal of 1097818220 is 228187901.

It is not an unprimeable number, because it can be changed into a prime (1097818223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448706 + ... + 451145.

It is an arithmetic number, because the mean of its divisors is an integer number (97633942).

Almost surely, 2^1097818220 is an apocalyptic number.

1097818220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097818220 is an abundant number, since it is smaller than the sum of its proper divisors (1245396388).

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

1097818220 is a wasteful number, since it uses less digits than its factorization.

1097818220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899921 (or 899919 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 1097818220 is about 33133.3400067062. The cubic root of 1097818220 is about 1031.5971764290.

The spelling of 1097818220 in words is "one billion, ninety-seven million, eight hundred eighteen thousand, two hundred twenty".