428212691 has 4 divisors (see below), whose sum is σ = 428256192. Its totient is φ = 428169192.

The previous prime is 428212679. The next prime is 428212699. The reversal of 428212691 is 196212824.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428212691 is a prime.

It is a super-2 number, since 2×428212691² = 366732217466922962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428212699) 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, 830 + ... + 29276.

It is an arithmetic number, because the mean of its divisors is an integer number (107064048).

Almost surely, 2^428212691 is an apocalyptic number.

428212691 is a deficient number, since it is larger than the sum of its proper divisors (43501).

428212691 is a wasteful number, since it uses less digits than its factorization.

428212691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43500.

The product of its digits is 13824, while the sum is 35.

The square root of 428212691 is about 20693.3006308805. The cubic root of 428212691 is about 753.7370174153.

The spelling of 428212691 in words is "four hundred twenty-eight million, two hundred twelve thousand, six hundred ninety-one".