1283940 has 72 divisors (see below), whose sum is σ = 4455360. Its totient is φ = 293184.

The previous prime is 1283939. The next prime is 1283941. The reversal of 1283940 is 493821.

It is an interprime number because it is at equal distance from previous prime (1283939) and next prime (1283941).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1283941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 751 + ... + 1769.

It is an arithmetic number, because the mean of its divisors is an integer number (61880).

2^1283940 is an apocalyptic number.

1283940 is a gapful number since it is divisible by the number (10) 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 1283940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2227680).

1283940 is an abundant number, since it is smaller than the sum of its proper divisors (3171420).

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

1283940 is a wasteful number, since it uses less digits than its factorization.

1283940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1283940 is about 1133.1107624588. The cubic root of 1283940 is about 108.6879947765.

The spelling of 1283940 in words is "one million, two hundred eighty-three thousand, nine hundred forty".