428946991 has 8 divisors (see below), whose sum is σ = 468480384. Its totient is φ = 389503320.

The previous prime is 428946979. The next prime is 428947027. The reversal of 428946991 is 199649824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428946991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428946971) 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, 12225 + ... + 31738.

It is an arithmetic number, because the mean of its divisors is an integer number (58560048).

Almost surely, 2^428946991 is an apocalyptic number.

428946991 is a deficient number, since it is larger than the sum of its proper divisors (39533393).

428946991 is a wasteful number, since it uses less digits than its factorization.

428946991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44861.

The product of its digits is 1119744, while the sum is 52.

The square root of 428946991 is about 20711.0354883574. The cubic root of 428946991 is about 754.1676079771.

The spelling of 428946991 in words is "four hundred twenty-eight million, nine hundred forty-six thousand, nine hundred ninety-one".