1997537280 has 168 divisors, whose sum is σ = 6442447872. Its totient is φ = 528482304.

The previous prime is 1997537249. The next prime is 1997537287. The reversal of 1997537280 is 827357991.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1997537287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15728577 + ... + 15728703.

It is an arithmetic number, because the mean of its divisors is an integer number (38347904).

Almost surely, 2^1997537280 is an apocalyptic number.

1997537280 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 1997537280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3221223936).

1997537280 is an abundant number, since it is smaller than the sum of its proper divisors (4444910592).

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

1997537280 is an frugal number, since it uses more digits than its factorization.

1997537280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 51.

The square root of 1997537280 is about 44693.8170220446. The cubic root of 1997537280 is about 1259.4036986935.

The spelling of 1997537280 in words is "one billion, nine hundred ninety-seven million, five hundred thirty-seven thousand, two hundred eighty".