1820980 has 24 divisors (see below), whose sum is σ = 4370688. Its totient is φ = 624288.

The previous prime is 1820977. The next prime is 1820983. The reversal of 1820980 is 890281.

It is an interprime number because it is at equal distance from previous prime (1820977) and next prime (1820983).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820983) 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 7 ways as a sum of consecutive naturals, for example, 6364 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (182112).

2^1820980 is an apocalyptic number.

1820980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820980 is an abundant number, since it is smaller than the sum of its proper divisors (2549708).

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

1820980 is a wasteful number, since it uses less digits than its factorization.

1820980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13023 (or 13021 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1820980 is about 1349.4369196076. The cubic root of 1820980 is about 122.1148251555.

The spelling of 1820980 in words is "one million, eight hundred twenty thousand, nine hundred eighty".