997500000 has 384 divisors, whose sum is σ = 3937489920. Its totient is φ = 216000000.

The previous prime is 997499933. The next prime is 997500043. The reversal of 997500000 is 5799.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52499991 + ... + 52500009.

It is an arithmetic number, because the mean of its divisors is an integer number (10253880).

Almost surely, 2^997500000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1968744960).

997500000 is an abundant number, since it is smaller than the sum of its proper divisors (2939989920).

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

997500000 is an frugal number, since it uses more digits than its factorization.

997500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 2835, while the sum is 30.

The square root of 997500000 is about 31583.2233947075. The cubic root of 997500000 is about 999.1659712561.

Adding to 997500000 its reverse (5799), we get a palindrome (997505799).

The spelling of 997500000 in words is "nine hundred ninety-seven million, five hundred thousand".