1097197920 has 384 divisors, whose sum is σ = 4728084480. Its totient is φ = 231413760.

The previous prime is 1097197909. The next prime is 1097197931. The reversal of 1097197920 is 297917901.

It is an interprime number because it is at equal distance from previous prime (1097197909) and next prime (1097197931).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 391725 + ... + 394515.

It is an arithmetic number, because the mean of its divisors is an integer number (12312720).

Almost surely, 2^1097197920 is an apocalyptic number.

1097197920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1097197920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2364042240).

1097197920 is an abundant number, since it is smaller than the sum of its proper divisors (3630886560).

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

1097197920 is a wasteful number, since it uses less digits than its factorization.

1097197920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835 (or 2821 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 45.

The square root of 1097197920 is about 33123.9780219707. The cubic root of 1097197920 is about 1031.4028454443.

The spelling of 1097197920 in words is "one billion, ninety-seven million, one hundred ninety-seven thousand, nine hundred twenty".