427021784 has 16 divisors (see below), whose sum is σ = 915046800. Its totient is φ = 183009312.

The previous prime is 427021757. The next prime is 427021787. The reversal of 427021784 is 487120724.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427021787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3812639 + ... + 3812750.

It is an arithmetic number, because the mean of its divisors is an integer number (57190425).

Almost surely, 2^427021784 is an apocalyptic number.

It is an amenable number.

427021784 is an abundant number, since it is smaller than the sum of its proper divisors (488025016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

427021784 is a wasteful number, since it uses less digits than its factorization.

427021784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7625402 (or 7625398 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 427021784 is about 20664.5054138733. The cubic root of 427021784 is about 753.0376265643.

The spelling of 427021784 in words is "four hundred twenty-seven million, twenty-one thousand, seven hundred eighty-four".