202402009 has 2 divisors, whose sum is σ = 202402010. Its totient is φ = 202402008.

The previous prime is 202401971. The next prime is 202402021. The reversal of 202402009 is 900204202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 90782784 = 10565^2 + 9528^2 .

It is a cyclic number.

It is not a de Polignac number, because 202402009 - 2⁹ = 202401497 is a prime.

It is not a weakly prime, because it can be changed into another prime (202402309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101201004 + 101201005.

It is an arithmetic number, because the mean of its divisors is an integer number (101201005).

Almost surely, 2^202402009 is an apocalyptic number.

It is an amenable number.

202402009 is a deficient number, since it is larger than the sum of its proper divisors (1).

202402009 is an equidigital number, since it uses as much as digits as its factorization.

202402009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 202402009 is about 14226.8060013483. The cubic root of 202402009 is about 587.1354094616.

The spelling of 202402009 in words is "two hundred two million, four hundred two thousand, nine".