420291111 has 8 divisors (see below), whose sum is σ = 563044864. Its totient is φ = 278865720.

The previous prime is 420291083. The next prime is 420291143. The reversal of 420291111 is 111192024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-420291111 is a prime.

It is a super-2 number, since 2×420291111² = 353289235971228642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420291611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331351 + ... + 332616.

It is an arithmetic number, because the mean of its divisors is an integer number (70380608).

Almost surely, 2^420291111 is an apocalyptic number.

420291111 is a deficient number, since it is larger than the sum of its proper divisors (142753753).

420291111 is a wasteful number, since it uses less digits than its factorization.

420291111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664181.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 420291111 is about 20501.0026827958. The cubic root of 420291111 is about 749.0602220261.

The spelling of 420291111 in words is "four hundred twenty million, two hundred ninety-one thousand, one hundred eleven".