428379985 has 16 divisors (see below), whose sum is σ = 590304960. Its totient is φ = 295151040.

The previous prime is 428379983. The next prime is 428379989. The reversal of 428379985 is 589973824.

It is not a de Polignac number, because 428379985 - 2¹ = 428379983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (428379983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203922 + ... + 206011.

It is an arithmetic number, because the mean of its divisors is an integer number (36894060).

Almost surely, 2^428379985 is an apocalyptic number.

It is an amenable number.

428379985 is a deficient number, since it is larger than the sum of its proper divisors (161924975).

428379985 is a wasteful number, since it uses less digits than its factorization.

428379985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409968.

The product of its digits is 4354560, while the sum is 55.

The square root of 428379985 is about 20697.3424622583. The cubic root of 428379985 is about 753.8351612161.

The spelling of 428379985 in words is "four hundred twenty-eight million, three hundred seventy-nine thousand, nine hundred eighty-five".