656934409 has 8 divisors (see below), whose sum is σ = 663664832. Its totient is φ = 650235600.

The previous prime is 656934407. The next prime is 656934449. The reversal of 656934409 is 904439656.

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 656934409 - 2¹ = 656934407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656934407) 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, 35047 + ... + 50419.

It is an arithmetic number, because the mean of its divisors is an integer number (82958104).

Almost surely, 2^656934409 is an apocalyptic number.

It is an amenable number.

656934409 is a deficient number, since it is larger than the sum of its proper divisors (6730423).

656934409 is a wasteful number, since it uses less digits than its factorization.

656934409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15807.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 656934409 is about 25630.7317297029. The cubic root of 656934409 is about 869.3086545376.

The spelling of 656934409 in words is "six hundred fifty-six million, nine hundred thirty-four thousand, four hundred nine".