421866947 has 2 divisors, whose sum is σ = 421866948. Its totient is φ = 421866946.

The previous prime is 421866923. The next prime is 421866997. The reversal of 421866947 is 749668124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421866947 - 2⁸ = 421866691 is a prime.

It is a super-2 number, since 2×421866947² = 355943441942201618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421866997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210933473 + 210933474.

It is an arithmetic number, because the mean of its divisors is an integer number (210933474).

Almost surely, 2^421866947 is an apocalyptic number.

421866947 is a deficient number, since it is larger than the sum of its proper divisors (1).

421866947 is an equidigital number, since it uses as much as digits as its factorization.

421866947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 421866947 is about 20539.3998695191. The cubic root of 421866947 is about 749.9952278215.

The spelling of 421866947 in words is "four hundred twenty-one million, eight hundred sixty-six thousand, nine hundred forty-seven".