997643952 has 100 divisors (see below), whose sum is σ = 3013103280. Its totient is φ = 318079872.

The previous prime is 997643947. The next prime is 997643957. The reversal of 997643952 is 259346799.

997643952 is a `hidden beast` number, since 99 + 76 + 439 + 52 = 666.

It is an interprime number because it is at equal distance from previous prime (997643947) and next prime (997643957).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (997643957) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13074 + ... + 46542.

Almost surely, 2^997643952 is an apocalyptic number.

997643952 is a gapful number since it is divisible by the number (92) 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 997643952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1506551640).

997643952 is an abundant number, since it is smaller than the sum of its proper divisors (2015459328).

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

997643952 is a wasteful number, since it uses less digits than its factorization.

997643952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33512 (or 33497 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 997643952 is about 31585.5022439093. The cubic root of 997643952 is about 999.2140330845.

The spelling of 997643952 in words is "nine hundred ninety-seven million, six hundred forty-three thousand, nine hundred fifty-two".