1379840 has 120 divisors (see below), whose sum is σ = 4198392. Its totient is φ = 430080.

The previous prime is 1379821. The next prime is 1379857. The reversal of 1379840 is 489731.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1379797 and 1379806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125435 + ... + 125445.

2^1379840 is an apocalyptic number.

1379840 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 1379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2099196).

1379840 is an abundant number, since it is smaller than the sum of its proper divisors (2818552).

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

1379840 is an equidigital number, since it uses as much as digits as its factorization.

1379840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48 (or 25 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1379840 is about 1174.6659099506. The cubic root of 1379840 is about 111.3293252369.

The spelling of 1379840 in words is "one million, three hundred seventy-nine thousand, eight hundred forty".