420403979 has 2 divisors, whose sum is σ = 420403980. Its totient is φ = 420403978.

The previous prime is 420403967. The next prime is 420404011. The reversal of 420403979 is 979304024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420403979 is a prime.

It is a Chen prime.

It is equal to p_22364795 and since 420403979 and 22364795 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (420406979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210201989 + 210201990.

It is an arithmetic number, because the mean of its divisors is an integer number (210201990).

Almost surely, 2^420403979 is an apocalyptic number.

420403979 is a deficient number, since it is larger than the sum of its proper divisors (1).

420403979 is an equidigital number, since it uses as much as digits as its factorization.

420403979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 420403979 is about 20503.7552414186. The cubic root of 420403979 is about 749.1272686992.

The spelling of 420403979 in words is "four hundred twenty million, four hundred three thousand, nine hundred seventy-nine".