997980489 has 24 divisors (see below), whose sum is σ = 1623308544. Its totient is φ = 585324000.

The previous prime is 997980481. The next prime is 997980497. The reversal of 997980489 is 984089799.

997980489 is a `hidden beast` number, since 9 + 9 + 79 + 80 + 489 = 666.

It is an interprime number because it is at equal distance from previous prime (997980481) and next prime (997980497).

It is not a de Polignac number, because 997980489 - 2³ = 997980481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (997980481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159522 + ... + 165659.

It is an arithmetic number, because the mean of its divisors is an integer number (67637856).

Almost surely, 2^997980489 is an apocalyptic number.

997980489 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

997980489 is a deficient number, since it is larger than the sum of its proper divisors (625328055).

997980489 is a wasteful number, since it uses less digits than its factorization.

997980489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325229 (or 325226 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The square root of 997980489 is about 31590.8291913967. The cubic root of 997980489 is about 999.3263759993.

The spelling of 997980489 in words is "nine hundred ninety-seven million, nine hundred eighty thousand, four hundred eighty-nine".