1285424 has 40 divisors (see below), whose sum is σ = 2976000. Its totient is φ = 525888.

The previous prime is 1285411. The next prime is 1285429. The reversal of 1285424 is 4245821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1285393 and 1285402.

It is not an unprimeable number, because it can be changed into a prime (1285429) 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, 2327 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (74400).

2^1285424 is an apocalyptic number.

1285424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1488000).

1285424 is an abundant number, since it is smaller than the sum of its proper divisors (1690576).

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

1285424 is a wasteful number, since it uses less digits than its factorization.

1285424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 531 counting only the distinct ones).

The product of its digits is 2560, while the sum is 26.

The square root of 1285424 is about 1133.7654078336. The cubic root of 1285424 is about 108.7298531402.

The spelling of 1285424 in words is "one million, two hundred eighty-five thousand, four hundred twenty-four".