428212947 has 16 divisors (see below), whose sum is σ = 575825312. Its totient is φ = 283046400.

The previous prime is 428212913. The next prime is 428212987. The reversal of 428212947 is 749212824.

It is a happy number.

It is not a de Polignac number, because 428212947 - 2⁷ = 428212819 is a prime.

It is a Smith number, since the sum of its digits (39) 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 not an unprimeable number, because it can be changed into a prime (428212907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355947 + ... + 357147.

It is an arithmetic number, because the mean of its divisors is an integer number (35989082).

Almost surely, 2^428212947 is an apocalyptic number.

428212947 is a deficient number, since it is larger than the sum of its proper divisors (147612365).

428212947 is a wasteful number, since it uses less digits than its factorization.

428212947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its digits is 64512, while the sum is 39.

The square root of 428212947 is about 20693.3068164564. The cubic root of 428212947 is about 753.7371676184.

The spelling of 428212947 in words is "four hundred twenty-eight million, two hundred twelve thousand, nine hundred forty-seven".