16977409 has 2 divisors, whose sum is σ = 16977410. Its totient is φ = 16977408.

The previous prime is 16977379. The next prime is 16977421. The reversal of 16977409 is 90477961.

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., 14938225 + 2039184 = 3865^2 + 1428^2 .

It is a cyclic number.

It is not a de Polignac number, because 16977409 - 2⁵ = 16977377 is a prime.

It is not a weakly prime, because it can be changed into another prime (16977479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8488704 + 8488705.

It is an arithmetic number, because the mean of its divisors is an integer number (8488705).

Almost surely, 2^16977409 is an apocalyptic number.

It is an amenable number.

16977409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16977409 is an equidigital number, since it uses as much as digits as its factorization.

16977409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 16977409 is about 4120.3651537212. The cubic root of 16977409 is about 257.0142108853.

The spelling of 16977409 in words is "sixteen million, nine hundred seventy-seven thousand, four hundred nine".