1285140 has 24 divisors (see below), whose sum is σ = 3598560. Its totient is φ = 342688.

The previous prime is 1285139. The next prime is 1285147. The reversal of 1285140 is 415821.

1285140 = T₂₄₉ + T₂₅₀ + ... + T₂₈₄.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285147) 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, 10650 + ... + 10769.

It is an arithmetic number, because the mean of its divisors is an integer number (149940).

2^1285140 is an apocalyptic number.

1285140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285140 is an abundant number, since it is smaller than the sum of its proper divisors (2313420).

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

1285140 is a wasteful number, since it uses less digits than its factorization.

1285140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21431 (or 21429 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1285140 is about 1133.6401545464. The cubic root of 1285140 is about 108.7218450036.

The spelling of 1285140 in words is "one million, two hundred eighty-five thousand, one hundred forty".