923947509 has 4 divisors (see below), whose sum is σ = 1231930016. Its totient is φ = 615965004.

The previous prime is 923947499. The next prime is 923947543. The reversal of 923947509 is 905749329.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 923947509 - 2⁵ = 923947477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (923947109) 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, 153991249 + ... + 153991254.

It is an arithmetic number, because the mean of its divisors is an integer number (307982504).

Almost surely, 2^923947509 is an apocalyptic number.

It is an amenable number.

923947509 is a deficient number, since it is larger than the sum of its proper divisors (307982507).

923947509 is a wasteful number, since it uses less digits than its factorization.

923947509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307982506.

The product of its (nonzero) digits is 612360, while the sum is 48.

The square root of 923947509 is about 30396.5048813182. The cubic root of 923947509 is about 973.9778932505.

The spelling of 923947509 in words is "nine hundred twenty-three million, nine hundred forty-seven thousand, five hundred nine".