1380240 has 120 divisors (see below), whose sum is σ = 4874688. Its totient is φ = 362880.

The previous prime is 1380233. The next prime is 1380241. The reversal of 1380240 is 420831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1380241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19405 + ... + 19475.

2^1380240 is an apocalyptic number.

1380240 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 1380240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2437344).

1380240 is an abundant number, since it is smaller than the sum of its proper divisors (3494448).

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

1380240 is an equidigital number, since it uses as much as digits as its factorization.

1380240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1380240 is about 1174.8361587898. The cubic root of 1380240 is about 111.3400819014.

The spelling of 1380240 in words is "one million, three hundred eighty thousand, two hundred forty".