1285400 has 24 divisors (see below), whose sum is σ = 2989020. Its totient is φ = 514080.

The previous prime is 1285397. The next prime is 1285411. The reversal of 1285400 is 45821.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3014 + ... + 3413.

2^1285400 is an apocalyptic number.

1285400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285400 is an abundant number, since it is smaller than the sum of its proper divisors (1703620).

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

1285400 is a wasteful number, since it uses less digits than its factorization.

1285400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443 (or 6434 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1285400 is about 1133.7548235840. The cubic root of 1285400 is about 108.7291764419.

The spelling of 1285400 in words is "one million, two hundred eighty-five thousand, four hundred".