402447109 has 2 divisors, whose sum is σ = 402447110. Its totient is φ = 402447108.

The previous prime is 402447107. The next prime is 402447161. The reversal of 402447109 is 901744204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235469025 + 166978084 = 15345^2 + 12922^2 .

It is a cyclic number.

It is not a de Polignac number, because 402447109 - 2¹ = 402447107 is a prime.

Together with 402447107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402447107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201223554 + 201223555.

It is an arithmetic number, because the mean of its divisors is an integer number (201223555).

Almost surely, 2^402447109 is an apocalyptic number.

It is an amenable number.

402447109 is a deficient number, since it is larger than the sum of its proper divisors (1).

402447109 is an equidigital number, since it uses as much as digits as its factorization.

402447109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 402447109 is about 20061.0844422728. The cubic root of 402447109 is about 738.3057838112.

The spelling of 402447109 in words is "four hundred two million, four hundred forty-seven thousand, one hundred nine".