1988609 has 12 divisors (see below), whose sum is σ = 2416704. Its totient is φ = 1602624.

The previous prime is 1988599. The next prime is 1988611. The reversal of 1988609 is 9068891.

It is not a de Polignac number, because 1988609 - 2⁸ = 1988353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1988659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1532 + ... + 2514.

It is an arithmetic number, because the mean of its divisors is an integer number (201392).

It is a Proth number, since it is equal to 971 ⋅ 2¹¹ + 1 and 971 < 2¹¹.

2^1988609 is an apocalyptic number.

It is an amenable number.

1988609 is a deficient number, since it is larger than the sum of its proper divisors (428095).

1988609 is an equidigital number, since it uses as much as digits as its factorization.

1988609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1988609 is about 1410.1804849026. The cubic root of 1988609 is about 125.7524534222.

The spelling of 1988609 in words is "one million, nine hundred eighty-eight thousand, six hundred nine".