1992409 has 2 divisors, whose sum is σ = 1992410. Its totient is φ = 1992408.

The previous prime is 1992407. The next prime is 1992433. The reversal of 1992409 is 9042991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 883600 = 1053^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992409 - 2¹ = 1992407 is a prime.

Together with 1992407, 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 (1992407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996204 + 996205.

It is an arithmetic number, because the mean of its divisors is an integer number (996205).

2^1992409 is an apocalyptic number.

It is an amenable number.

1992409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992409 is an equidigital number, since it uses as much as digits as its factorization.

1992409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1992409 is about 1411.5271871275. The cubic root of 1992409 is about 125.8325018828.

It can be divided in two parts, 1992 and 409, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1992409 in words is "one million, nine hundred ninety-two thousand, four hundred nine".