1980660 has 48 divisors (see below), whose sum is σ = 6052032. Its totient is φ = 480000.

The previous prime is 1980659. The next prime is 1980661. The reversal of 1980660 is 660891.

Added to its reverse (660891) it gives a triangular number (2641551 = T₂₂₉₈).

It is an interprime number because it is at equal distance from previous prime (1980659) and next prime (1980661).

It is a Harshad number since it is a multiple of its sum of digits (30).

1980660 is a Rhonda number in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841 + ... + 2160.

It is an arithmetic number, because the mean of its divisors is an integer number (126084).

2^1980660 is an apocalyptic number.

1980660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980660 is an abundant number, since it is smaller than the sum of its proper divisors (4071372).

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

1980660 is a wasteful number, since it uses less digits than its factorization.

1980660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024 (or 3022 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1980660 is about 1407.3592291949. The cubic root of 1980660 is about 125.5846743170.

Adding to 1980660 its reverse (660891), we get a triangular number (2641551 = T₂₂₉₈).

The spelling of 1980660 in words is "one million, nine hundred eighty thousand, six hundred sixty".