420994687 has 2 divisors, whose sum is σ = 420994688. Its totient is φ = 420994686.

The previous prime is 420994669. The next prime is 420994699. The reversal of 420994687 is 786499024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420994687 - 2¹¹ = 420992639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420994687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420994657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210497343 + 210497344.

It is an arithmetic number, because the mean of its divisors is an integer number (210497344).

Almost surely, 2^420994687 is an apocalyptic number.

420994687 is a deficient number, since it is larger than the sum of its proper divisors (1).

420994687 is an equidigital number, since it uses as much as digits as its factorization.

420994687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 420994687 is about 20518.1550583867. The cubic root of 420994687 is about 749.4779697673.

The spelling of 420994687 in words is "four hundred twenty million, nine hundred ninety-four thousand, six hundred eighty-seven".