423961891 has 2 divisors, whose sum is σ = 423961892. Its totient is φ = 423961890.

The previous prime is 423961883. The next prime is 423961939. The reversal of 423961891 is 198169324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423961891 - 2³ = 423961883 is a prime.

It is not a weakly prime, because it can be changed into another prime (423961831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211980945 + 211980946.

It is an arithmetic number, because the mean of its divisors is an integer number (211980946).

Almost surely, 2^423961891 is an apocalyptic number.

423961891 is a deficient number, since it is larger than the sum of its proper divisors (1).

423961891 is an equidigital number, since it uses as much as digits as its factorization.

423961891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 423961891 is about 20590.3348928569. The cubic root of 423961891 is about 751.2346425765.

The spelling of 423961891 in words is "four hundred twenty-three million, nine hundred sixty-one thousand, eight hundred ninety-one".