997971030 has 320 divisors, whose sum is σ = 3241700352. Its totient is φ = 215550720.

The previous prime is 997971019. The next prime is 997971031. The reversal of 997971030 is 30179799.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997971031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 14055895 + ... + 14055965.

Almost surely, 2^997971030 is an apocalyptic number.

997971030 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

997971030 is the 19980-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997971030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1620850176).

997971030 is an abundant number, since it is smaller than the sum of its proper divisors (2243729322).

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

997971030 is a wasteful number, since it uses less digits than its factorization.

997971030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 997971030 is about 31590.6794798719. The cubic root of 997971030 is about 999.3232187371.

The spelling of 997971030 in words is "nine hundred ninety-seven million, nine hundred seventy-one thousand, thirty".