1980261 has 16 divisors (see below), whose sum is σ = 2977920. Its totient is φ = 1300320.

The previous prime is 1980247. The next prime is 1980263. The reversal of 1980261 is 1620891.

It is not a de Polignac number, because 1980261 - 2⁵ = 1980229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980263) 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 15 ways as a sum of consecutive naturals, for example, 1401 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (186120).

2^1980261 is an apocalyptic number.

It is an amenable number.

1980261 is a deficient number, since it is larger than the sum of its proper divisors (997659).

1980261 is a wasteful number, since it uses less digits than its factorization.

1980261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 1107 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1980261 is about 1407.2174672026. The cubic root of 1980261 is about 125.5762408235.

The spelling of 1980261 in words is "one million, nine hundred eighty thousand, two hundred sixty-one".