43432409 has 2 divisors, whose sum is σ = 43432410. Its totient is φ = 43432408.

The previous prime is 43432397. The next prime is 43432421. The reversal of 43432409 is 90423434.

It is a balanced prime because it is at equal distance from previous prime (43432397) and next prime (43432421).

It can be written as a sum of positive squares in only one way, i.e., 35366809 + 8065600 = 5947^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 43432409 - 2²⁴ = 26655193 is a prime.

It is equal to p_2629109 and since 43432409 and 2629109 have the same sum of digits, it is a Honaker prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21716204 + 21716205.

It is an arithmetic number, because the mean of its divisors is an integer number (21716205).

Almost surely, 2^43432409 is an apocalyptic number.

It is an amenable number.

43432409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43432409 is an equidigital number, since it uses as much as digits as its factorization.

43432409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 43432409 is about 6590.3269266403. The cubic root of 43432409 is about 351.5102332268.

Subtracting 43432409 from its reverse (90423434), we obtain a square (46991025 = 6855²).

The spelling of 43432409 in words is "forty-three million, four hundred thirty-two thousand, four hundred nine".