420012811 has 4 divisors (see below), whose sum is σ = 420970000. Its totient is φ = 419055624.

The previous prime is 420012809. The next prime is 420012833. The reversal of 420012811 is 118210024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420012811 - 2¹ = 420012809 is a prime.

It is a super-2 number, since 2×420012811² = 352821522808243442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420012871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477936 + ... + 478813.

It is an arithmetic number, because the mean of its divisors is an integer number (105242500).

Almost surely, 2^420012811 is an apocalyptic number.

420012811 is a deficient number, since it is larger than the sum of its proper divisors (957189).

420012811 is an equidigital number, since it uses as much as digits as its factorization.

420012811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957188.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 420012811 is about 20494.2140859317. The cubic root of 420012811 is about 748.8948529257.

Adding to 420012811 its reverse (118210024), we get a palindrome (538222835).

The spelling of 420012811 in words is "four hundred twenty million, twelve thousand, eight hundred eleven".