420394756 has 6 divisors (see below), whose sum is σ = 735690830. Its totient is φ = 210197376.

The previous prime is 420394739. The next prime is 420394769. The reversal of 420394756 is 657493024.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 418857156 + 1537600 = 20466^2 + 1240^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52549341 + ... + 52549348.

Almost surely, 2^420394756 is an apocalyptic number.

It is an amenable number.

420394756 is a deficient number, since it is larger than the sum of its proper divisors (315296074).

420394756 is a wasteful number, since it uses less digits than its factorization.

420394756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105098693 (or 105098691 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 420394756 is about 20503.5303301651. The cubic root of 420394756 is about 749.1217904357.

The spelling of 420394756 in words is "four hundred twenty million, three hundred ninety-four thousand, seven hundred fifty-six".