23402009 has 2 divisors, whose sum is σ = 23402010. Its totient is φ = 23402008.

The previous prime is 23401981. The next prime is 23402039. The reversal of 23402009 is 90020432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 7441984 = 3995^2 + 2728^2 .

It is a cyclic number.

It is not a de Polignac number, because 23402009 - 2¹⁶ = 23336473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23402039) 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, 11701004 + 11701005.

It is an arithmetic number, because the mean of its divisors is an integer number (11701005).

Almost surely, 2^23402009 is an apocalyptic number.

It is an amenable number.

23402009 is a deficient number, since it is larger than the sum of its proper divisors (1).

23402009 is an equidigital number, since it uses as much as digits as its factorization.

23402009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 23402009 is about 4837.5622993404. The cubic root of 23402009 is about 286.0340359187.

The spelling of 23402009 in words is "twenty-three million, four hundred two thousand, nine".