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428388 = 223291231
BaseRepresentation
bin1101000100101100100
3210202122020
41220211210
5102202023
613103140
73432642
oct1504544
9722566
10428388
11272944
12187ab0
1311ccac
14b2192
1586de3
hex68964

428388 has 24 divisors (see below), whose sum is σ = 1034880. Its totient is φ = 137760.

The previous prime is 428369. The next prime is 428401. The reversal of 428388 is 883824.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (43120).

2428388 is an apocalyptic number.

It is an amenable number.

428388 is an abundant number, since it is smaller than the sum of its proper divisors (606492).

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

428388 is a wasteful number, since it uses less digits than its factorization.

428388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1265 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 428388 is about 654.5135598290. The cubic root of 428388 is about 75.3839862612.

It can be divided in two parts, 4283 and 88, that added together give a triangular number (4371 = T93).

The spelling of 428388 in words is "four hundred twenty-eight thousand, three hundred eighty-eight".

Divisors: 1 2 3 4 6 12 29 58 87 116 174 348 1231 2462 3693 4924 7386 14772 35699 71398 107097 142796 214194 428388