428820349 has 4 divisors (see below), whose sum is σ = 447464736. Its totient is φ = 410175964.

The previous prime is 428820347. The next prime is 428820377. The reversal of 428820349 is 943028824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428820349 - 2¹ = 428820347 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428820347) 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, 9322159 + ... + 9322204.

It is an arithmetic number, because the mean of its divisors is an integer number (111866184).

Almost surely, 2^428820349 is an apocalyptic number.

It is an amenable number.

428820349 is a deficient number, since it is larger than the sum of its proper divisors (18644387).

428820349 is a wasteful number, since it uses less digits than its factorization.

428820349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18644386.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 428820349 is about 20707.9779070773. The cubic root of 428820349 is about 754.0933807050.

The spelling of 428820349 in words is "four hundred twenty-eight million, eight hundred twenty thousand, three hundred forty-nine".