1386240 has 108 divisors (see below), whose sum is σ = 4672584. Its totient is φ = 350208.

The previous prime is 1386239. The next prime is 1386263. The reversal of 1386240 is 426831.

It is a happy number.

It is a super-2 number, since 2×1386240² = 3843322675200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1386240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72951 + ... + 72969.

2^1386240 is an apocalyptic number.

1386240 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 1386240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2336292).

1386240 is an abundant number, since it is smaller than the sum of its proper divisors (3286344).

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

1386240 is an equidigital number, since it uses as much as digits as its factorization.

1386240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1386240 is about 1177.3869372471. The cubic root of 1386240 is about 111.5011830664.

The spelling of 1386240 in words is "one million, three hundred eighty-six thousand, two hundred forty".