427221390 has 64 divisors (see below), whose sum is σ = 1088873280. Its totient is φ = 106905600.

The previous prime is 427221371. The next prime is 427221391. The reversal of 427221390 is 93122724.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427221391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203466 + ... + 205554.

It is an arithmetic number, because the mean of its divisors is an integer number (17013645).

Almost surely, 2^427221390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 427221390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (544436640).

427221390 is an abundant number, since it is smaller than the sum of its proper divisors (661651890).

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

427221390 is a wasteful number, since it uses less digits than its factorization.

427221390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 427221390 is about 20669.3345321033. The cubic root of 427221390 is about 753.1549409652.

The spelling of 427221390 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, three hundred ninety".