40432309 has 2 divisors, whose sum is σ = 40432310. Its totient is φ = 40432308.

The previous prime is 40432303. The next prime is 40432319. The reversal of 40432309 is 90323404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 3161284 = 6105^2 + 1778^2 .

It is a cyclic number.

It is not a de Polignac number, because 40432309 - 2¹¹ = 40430261 is a prime.

It is a super-2 number, since 2×40432309² = 3269543222142962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40432303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20216154 + 20216155.

It is an arithmetic number, because the mean of its divisors is an integer number (20216155).

Almost surely, 2^40432309 is an apocalyptic number.

It is an amenable number.

40432309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40432309 is an equidigital number, since it uses as much as digits as its factorization.

40432309 is an evil number, because the sum of its binary digits is even.

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

The square root of 40432309 is about 6358.6404993520. The cubic root of 40432309 is about 343.2228405142. Note that the first 3 decimals are identical.

The spelling of 40432309 in words is "forty million, four hundred thirty-two thousand, three hundred nine".