619988 has 18 divisors (see below), whose sum is σ = 1138074. Its totient is φ = 295504.

The previous prime is 619987. The next prime is 619999. The reversal of 619988 is 889916.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 8464 = 782^2 + 92^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (619981) 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 in 5 ways as a sum of consecutive naturals, for example, 1970 + ... + 2262.

2⁶¹⁹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

619988 is a deficient number, since it is larger than the sum of its proper divisors (518086).

619988 is a wasteful number, since it uses less digits than its factorization.

619988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 318 counting only the distinct ones).

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

The square root of 619988 is about 787.3931673567. The cubic root of 619988 is about 85.2696396990.

The spelling of 619988 in words is "six hundred nineteen thousand, nine hundred eighty-eight".