420783106 has 4 divisors (see below), whose sum is σ = 631174662. Its totient is φ = 210391552.

The previous prime is 420783073. The next prime is 420783109. The reversal of 420783106 is 601387024.

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., 420619081 + 164025 = 20509^2 + 405^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (420783109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105195775 + ... + 105195778.

Almost surely, 2^420783106 is an apocalyptic number.

420783106 is a deficient number, since it is larger than the sum of its proper divisors (210391556).

420783106 is a wasteful number, since it uses less digits than its factorization.

420783106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210391555.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 420783106 is about 20512.9984643884. The cubic root of 420783106 is about 749.3523926710.

The spelling of 420783106 in words is "four hundred twenty million, seven hundred eighty-three thousand, one hundred six".