43432009 has 4 divisors (see below), whose sum is σ = 43708804. Its totient is φ = 43155216.

The previous prime is 43432001. The next prime is 43432019. The reversal of 43432009 is 90023434.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4644025 + 38787984 = 2155^2 + 6228^2 .

It is a cyclic number.

It is not a de Polignac number, because 43432009 - 2³ = 43432001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43432001) 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, 138162 + ... + 138475.

It is an arithmetic number, because the mean of its divisors is an integer number (10927201).

Almost surely, 2^43432009 is an apocalyptic number.

It is an amenable number.

43432009 is a deficient number, since it is larger than the sum of its proper divisors (276795).

43432009 is a wasteful number, since it uses less digits than its factorization.

43432009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276794.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 43432009 is about 6590.2965790623. The cubic root of 43432009 is about 351.5091541207.

The spelling of 43432009 in words is "forty-three million, four hundred thirty-two thousand, nine".