421866938 has 4 divisors (see below), whose sum is σ = 632800410. Its totient is φ = 210933468.

The previous prime is 421866923. The next prime is 421866947. The reversal of 421866938 is 839668124.

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., 360354289 + 61512649 = 18983^2 + 7843^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421866892 and 421866901.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105466733 + ... + 105466736.

Almost surely, 2^421866938 is an apocalyptic number.

421866938 is a deficient number, since it is larger than the sum of its proper divisors (210933472).

421866938 is a wasteful number, since it uses less digits than its factorization.

421866938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210933471.

The product of its digits is 497664, while the sum is 47.

The square root of 421866938 is about 20539.3996504280. The cubic root of 421866938 is about 749.9952224881.

The spelling of 421866938 in words is "four hundred twenty-one million, eight hundred sixty-six thousand, nine hundred thirty-eight".