297920389 has 8 divisors (see below), whose sum is σ = 322612472. Its totient is φ = 273481920.

The previous prime is 297920387. The next prime is 297920417. The reversal of 297920389 is 983029792.

It can be written as a sum of positive squares in 4 ways, for example, as 46444225 + 251476164 = 6815^2 + 15858^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 297920389 - 2¹ = 297920387 is a prime.

It is a super-2 number, since 2×297920389² = 177513116363822642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (297920387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60954 + ... + 65659.

It is an arithmetic number, because the mean of its divisors is an integer number (40326559).

Almost surely, 2^297920389 is an apocalyptic number.

It is an amenable number.

297920389 is a deficient number, since it is larger than the sum of its proper divisors (24692083).

297920389 is a wasteful number, since it uses less digits than its factorization.

297920389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126807.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 297920389 is about 17260.3704769046. The cubic root of 297920389 is about 667.8825174069.

The spelling of 297920389 in words is "two hundred ninety-seven million, nine hundred twenty thousand, three hundred eighty-nine".