297994640 has 20 divisors (see below), whose sum is σ = 692837724. Its totient is φ = 119197824.

The previous prime is 297994639. The next prime is 297994643. The reversal of 297994640 is 46499792.

It can be written as a sum of positive squares in 2 ways, for example, as 137921536 + 160073104 = 11744^2 + 12652^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (297994643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1862387 + ... + 1862546.

Almost surely, 2^297994640 is an apocalyptic number.

297994640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

297994640 is an abundant number, since it is smaller than the sum of its proper divisors (394843084).

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

297994640 is a wasteful number, since it uses less digits than its factorization.

297994640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724946 (or 3724940 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 297994640 is about 17262.5212527023. The cubic root of 297994640 is about 667.9379984765.

The spelling of 297994640 in words is "two hundred ninety-seven million, nine hundred ninety-four thousand, six hundred forty".