1390284 has 60 divisors (see below), whose sum is σ = 4160464. Its totient is φ = 396576.

The previous prime is 1390283. The next prime is 1390297. The reversal of 1390284 is 4820931.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1390283) 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 19 ways as a sum of consecutive naturals, for example, 1962 + ... + 2574.

2^1390284 is an apocalyptic number.

1390284 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 1390284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2080232).

1390284 is an abundant number, since it is smaller than the sum of its proper divisors (2770180).

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

1390284 is a wasteful number, since it uses less digits than its factorization.

1390284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 625 counting only the distinct ones).

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

The square root of 1390284 is about 1179.1030489317. The cubic root of 1390284 is about 111.6095031796.

The spelling of 1390284 in words is "one million, three hundred ninety thousand, two hundred eighty-four".