1972777 has 2 divisors, whose sum is σ = 1972778. Its totient is φ = 1972776.

The previous prime is 1972741. The next prime is 1972781. The reversal of 1972777 is 7772791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1058841 + 913936 = 1029^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1972777 - 2¹¹ = 1970729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1972717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986388 + 986389.

It is an arithmetic number, because the mean of its divisors is an integer number (986389).

2^1972777 is an apocalyptic number.

It is an amenable number.

1972777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1972777 is an equidigital number, since it uses as much as digits as its factorization.

1972777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43218, while the sum is 40.

The square root of 1972777 is about 1404.5558016683. Note that the first 3 decimals coincide. The cubic root of 1972777 is about 125.4178443591.

The spelling of 1972777 in words is "one million, nine hundred seventy-two thousand, seven hundred seventy-seven".