420636947 has 2 divisors, whose sum is σ = 420636948. Its totient is φ = 420636946.

The previous prime is 420636943. The next prime is 420636973. The reversal of 420636947 is 749636024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420636947 - 2² = 420636943 is a prime.

It is not a weakly prime, because it can be changed into another prime (420636943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210318473 + 210318474.

It is an arithmetic number, because the mean of its divisors is an integer number (210318474).

Almost surely, 2^420636947 is an apocalyptic number.

420636947 is a deficient number, since it is larger than the sum of its proper divisors (1).

420636947 is an equidigital number, since it uses as much as digits as its factorization.

420636947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 420636947 is about 20509.4355602488. The cubic root of 420636947 is about 749.2656201126.

The spelling of 420636947 in words is "four hundred twenty million, six hundred thirty-six thousand, nine hundred forty-seven".