1992609 has 6 divisors (see below), whose sum is σ = 2878226. Its totient is φ = 1328400.

The previous prime is 1992589. The next prime is 1992611. The reversal of 1992609 is 9062991.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 88209 = 1380^2 + 297^2 .

It is not a de Polignac number, because 1992609 - 2⁷ = 1992481 is a prime.

It is a Duffinian number.

1992609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1992409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110692 + ... + 110709.

2^1992609 is an apocalyptic number.

It is an amenable number.

1992609 is a deficient number, since it is larger than the sum of its proper divisors (885617).

1992609 is a wasteful number, since it uses less digits than its factorization.

1992609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221407 (or 221404 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 1992609 is about 1411.5980306022. The cubic root of 1992609 is about 125.8367121392.

It can be divided in two parts, 1992 and 609, that added together give a square (2601 = 51²).

The spelling of 1992609 in words is "one million, nine hundred ninety-two thousand, six hundred nine".