297390021 has 16 divisors (see below), whose sum is σ = 406824000. Its totient is φ = 193132800.

The previous prime is 297390017. The next prime is 297390047. The reversal of 297390021 is 120093792.

It is not a de Polignac number, because 297390021 - 2² = 297390017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (297390001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48855 + ... + 54603.

It is an arithmetic number, because the mean of its divisors is an integer number (25426500).

Almost surely, 2^297390021 is an apocalyptic number.

It is an amenable number.

297390021 is a deficient number, since it is larger than the sum of its proper divisors (109433979).

297390021 is a wasteful number, since it uses less digits than its factorization.

297390021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 297390021 is about 17244.9998840244. Note that the first 3 decimals coincide. The cubic root of 297390021 is about 667.4859529370.

The spelling of 297390021 in words is "two hundred ninety-seven million, three hundred ninety thousand, twenty-one".