8420977 has 2 divisors, whose sum is σ = 8420978. Its totient is φ = 8420976.

The previous prime is 8420969. The next prime is 8420983. The reversal of 8420977 is 7790248.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6574096 + 1846881 = 2564^2 + 1359^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420977 - 2³ = 8420969 is a prime.

It is not a weakly prime, because it can be changed into another prime (8420917) 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 as a sum of consecutive naturals, namely, 4210488 + 4210489.

It is an arithmetic number, because the mean of its divisors is an integer number (4210489).

Almost surely, 2^8420977 is an apocalyptic number.

It is an amenable number.

8420977 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420977 is an equidigital number, since it uses as much as digits as its factorization.

8420977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 8420977 is about 2901.8919690436. The cubic root of 8420977 is about 203.4483445611.

The spelling of 8420977 in words is "eight million, four hundred twenty thousand, nine hundred seventy-seven".