428209406 has 4 divisors (see below), whose sum is σ = 642314112. Its totient is φ = 214104702.

The previous prime is 428209343. The next prime is 428209429. The reversal of 428209406 is 604902824.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107052350 + ... + 107052353.

It is an arithmetic number, because the mean of its divisors is an integer number (160578528).

Almost surely, 2^428209406 is an apocalyptic number.

428209406 is a deficient number, since it is larger than the sum of its proper divisors (214104706).

428209406 is a wasteful number, since it uses less digits than its factorization.

428209406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214104705.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 428209406 is about 20693.2212572137. The cubic root of 428209406 is about 753.7350899989.

The spelling of 428209406 in words is "four hundred twenty-eight million, two hundred nine thousand, four hundred six".