97920009 has 28 divisors (see below), whose sum is σ = 160172592. Its totient is φ = 59340600.

The previous prime is 97920001. The next prime is 97920023. The reversal of 97920009 is 90002979.

It is not a de Polignac number, because 97920009 - 2³ = 97920001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97920001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1914 + ... + 14124.

Almost surely, 2^97920009 is an apocalyptic number.

97920009 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

97920009 is a deficient number, since it is larger than the sum of its proper divisors (62252583).

97920009 is a wasteful number, since it uses less digits than its factorization.

97920009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12240 (or 12225 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 97920009 is about 9895.4539562367. The cubic root of 97920009 is about 460.9181551257.

The spelling of 97920009 in words is "ninety-seven million, nine hundred twenty thousand, nine".