420673786 has 24 divisors (see below), whose sum is σ = 687951900. Its totient is φ = 192830976.

The previous prime is 420673783. The next prime is 420673819. The reversal of 420673786 is 687376024.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 27405225 + 393268561 = 5235^2 + 19831^2 .

It is a super-3 number, since 3×420673786³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (420673783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46186 + ... + 54538.

Almost surely, 2^420673786 is an apocalyptic number.

420673786 is a deficient number, since it is larger than the sum of its proper divisors (267278114).

420673786 is a wasteful number, since it uses less digits than its factorization.

420673786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8530 (or 8517 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 420673786 is about 20510.3336394121. Note that the first 3 decimals coincide. The cubic root of 420673786 is about 749.2874928072.

The spelling of 420673786 in words is "four hundred twenty million, six hundred seventy-three thousand, seven hundred eighty-six".