1980388 has 12 divisors (see below), whose sum is σ = 3559612. Its totient is φ = 963360.

The previous prime is 1980383. The next prime is 1980397. The reversal of 1980388 is 8830891.

It can be written as a sum of positive squares in 2 ways, for example, as 1016064 + 964324 = 1008^2 + 982^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (1980383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6543 + ... + 6838.

2^1980388 is an apocalyptic number.

It is an amenable number.

1980388 is a deficient number, since it is larger than the sum of its proper divisors (1579224).

1980388 is a wasteful number, since it uses less digits than its factorization.

1980388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13422 (or 13420 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1980388 is about 1407.2625909900. The cubic root of 1980388 is about 125.5789252914.

It can be divided in two parts, 19803 and 88, that added together give a palindrome (19891).

The spelling of 1980388 in words is "one million, nine hundred eighty thousand, three hundred eighty-eight".