428390 has 8 divisors (see below), whose sum is σ = 771120. Its totient is φ = 171352.

The previous prime is 428369. The next prime is 428401. The reversal of 428390 is 93824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

428390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21410 + ... + 21429.

It is an arithmetic number, because the mean of its divisors is an integer number (96390).

2⁴²⁸³⁹⁰ is an apocalyptic number.

428390 is a deficient number, since it is larger than the sum of its proper divisors (342730).

428390 is a wasteful number, since it uses less digits than its factorization.

428390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42846.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 428390 is about 654.5150876794. The cubic root of 428390 is about 75.3841035752.

It can be divided in two parts, 428 and 390, that added together give a palindrome (818).

The spelling of 428390 in words is "four hundred twenty-eight thousand, three hundred ninety".