421671946 has 4 divisors (see below), whose sum is σ = 632507922. Its totient is φ = 210835972.

The previous prime is 421671931. The next prime is 421671967. The reversal of 421671946 is 649176124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 402443721 + 19228225 = 20061^2 + 4385^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 421671899 and 421671908.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105417985 + ... + 105417988.

Almost surely, 2^421671946 is an apocalyptic number.

421671946 is a deficient number, since it is larger than the sum of its proper divisors (210835976).

421671946 is a wasteful number, since it uses less digits than its factorization.

421671946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210835975.

The product of its digits is 72576, while the sum is 40.

The square root of 421671946 is about 20534.6523223550. The cubic root of 421671946 is about 749.8796523933.

The spelling of 421671946 in words is "four hundred twenty-one million, six hundred seventy-one thousand, nine hundred forty-six".