649040297 has 8 divisors (see below), whose sum is σ = 698868000. Its totient is φ = 600506944.

The previous prime is 649040281. The next prime is 649040303. The reversal of 649040297 is 792040946.

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 649040297 - 2⁴ = 649040281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649040257) 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, 322547 + ... + 324552.

It is an arithmetic number, because the mean of its divisors is an integer number (87358500).

Almost surely, 2^649040297 is an apocalyptic number.

It is an amenable number.

649040297 is a deficient number, since it is larger than the sum of its proper divisors (49827703).

649040297 is a wasteful number, since it uses less digits than its factorization.

649040297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647175.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 649040297 is about 25476.2692912444. The cubic root of 649040297 is about 865.8125711108.

The spelling of 649040297 in words is "six hundred forty-nine million, forty thousand, two hundred ninety-seven".