44402009 has 2 divisors, whose sum is σ = 44402010. Its totient is φ = 44402008.

The previous prime is 44401999. The next prime is 44402023. The reversal of 44402009 is 90020444.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 3888784 = 6365^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 44402009 - 2²⁰ = 43353433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (44402089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22201004 + 22201005.

It is an arithmetic number, because the mean of its divisors is an integer number (22201005).

Almost surely, 2^44402009 is an apocalyptic number.

It is an amenable number.

44402009 is a deficient number, since it is larger than the sum of its proper divisors (1).

44402009 is an equidigital number, since it uses as much as digits as its factorization.

44402009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 44402009 is about 6663.4832482719. The cubic root of 44402009 is about 354.1067511901.

The spelling of 44402009 in words is "forty-four million, four hundred two thousand, nine".