611988 has 24 divisors (see below), whose sum is σ = 1538208. Its totient is φ = 188256.

The previous prime is 611977. The next prime is 611993. The reversal of 611988 is 889116.

611988 is nontrivially palindromic in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 611988.

It is an unprimeable number.

611988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1806 + ... + 2117.

It is an arithmetic number, because the mean of its divisors is an integer number (64092).

2⁶¹¹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

611988 is an abundant number, since it is smaller than the sum of its proper divisors (926220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611988 is a wasteful number, since it uses less digits than its factorization.

611988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943 (or 3941 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 611988 is about 782.2966189368. The cubic root of 611988 is about 84.9012925701.

The spelling of 611988 in words is "six hundred eleven thousand, nine hundred eighty-eight".