192940409 has 2 divisors, whose sum is σ = 192940410. Its totient is φ = 192940408.

The previous prime is 192940403. The next prime is 192940417. The reversal of 192940409 is 904049291.

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., 189888400 + 3052009 = 13780^2 + 1747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-192940409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (192940403) 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, 96470204 + 96470205.

It is an arithmetic number, because the mean of its divisors is an integer number (96470205).

Almost surely, 2^192940409 is an apocalyptic number.

It is an amenable number.

192940409 is a deficient number, since it is larger than the sum of its proper divisors (1).

192940409 is an equidigital number, since it uses as much as digits as its factorization.

192940409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 192940409 is about 13890.2990968517. The cubic root of 192940409 is about 577.8401726406.

The spelling of 192940409 in words is "one hundred ninety-two million, nine hundred forty thousand, four hundred nine".