1980757 has 2 divisors, whose sum is σ = 1980758. Its totient is φ = 1980756.

The previous prime is 1980749. The next prime is 1980761. The reversal of 1980757 is 7570891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1962801 + 17956 = 1401^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980757 - 2³ = 1980749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990378 + 990379.

It is an arithmetic number, because the mean of its divisors is an integer number (990379).

2^1980757 is an apocalyptic number.

It is an amenable number.

1980757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980757 is an equidigital number, since it uses as much as digits as its factorization.

1980757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1980757 is about 1407.3936904790. The cubic root of 1980757 is about 125.5867243937.

The spelling of 1980757 in words is "one million, nine hundred eighty thousand, seven hundred fifty-seven".