1021988 has 12 divisors (see below), whose sum is σ = 1951152. Its totient is φ = 464520.

The previous prime is 1021973. The next prime is 1022011. The reversal of 1021988 is 8891201.

It is a self number, because there is not a number n which added to its sum of digits gives 1021988.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11570 + ... + 11657.

It is an arithmetic number, because the mean of its divisors is an integer number (162596).

2^1021988 is an apocalyptic number.

It is an amenable number.

1021988 is a deficient number, since it is larger than the sum of its proper divisors (929164).

1021988 is a wasteful number, since it uses less digits than its factorization.

1021988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23242 (or 23240 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1021988 is about 1010.9342214012. The cubic root of 1021988 is about 100.7276260949.

The spelling of 1021988 in words is "one million, twenty-one thousand, nine hundred eighty-eight".