409620979 has 2 divisors, whose sum is σ = 409620980. Its totient is φ = 409620978.

The previous prime is 409620977. The next prime is 409620983. The reversal of 409620979 is 979026904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 409620979 - 2¹ = 409620977 is a prime.

Together with 409620977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (409620971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204810489 + 204810490.

It is an arithmetic number, because the mean of its divisors is an integer number (204810490).

Almost surely, 2^409620979 is an apocalyptic number.

409620979 is a deficient number, since it is larger than the sum of its proper divisors (1).

409620979 is an equidigital number, since it uses as much as digits as its factorization.

409620979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 409620979 is about 20239.0953108087. The cubic root of 409620979 is about 742.6668923142. Note that the first 3 decimals are identical.

The spelling of 409620979 in words is "four hundred nine million, six hundred twenty thousand, nine hundred seventy-nine".