428487 has 8 divisors (see below), whose sum is σ = 574704. Its totient is φ = 283968.

The previous prime is 428473. The next prime is 428489. The reversal of 428487 is 784824.

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

It is not a de Polignac number, because 428487 - 2⁴ = 428471 is a prime.

It is a super-2 number, since 2×428487² = 367202218338, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428487.

It is not an unprimeable number, because it can be changed into a prime (428489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393 + ... + 1005.

It is an arithmetic number, because the mean of its divisors is an integer number (71838).

2⁴²⁸⁴⁸⁷ is an apocalyptic number.

428487 is a deficient number, since it is larger than the sum of its proper divisors (146217).

428487 is a wasteful number, since it uses less digits than its factorization.

428487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its digits is 14336, while the sum is 33.

The square root of 428487 is about 654.5891841453. The cubic root of 428487 is about 75.3897928662.

It can be divided in two parts, 4284 and 87, that added together give a triangular number (4371 = T₉₃).

The spelling of 428487 in words is "four hundred twenty-eight thousand, four hundred eighty-seven".