1378740 has 48 divisors (see below), whose sum is σ = 4213440. Its totient is φ = 334080.

The previous prime is 1378733. The next prime is 1378759. The reversal of 1378740 is 478731.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1378698 and 1378707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385 + ... + 1704.

It is an arithmetic number, because the mean of its divisors is an integer number (87780).

2^1378740 is an apocalyptic number.

1378740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1378740 is an abundant number, since it is smaller than the sum of its proper divisors (2834700).

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

1378740 is a wasteful number, since it uses less digits than its factorization.

1378740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2110 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 1378740 is about 1174.1975983624. The cubic root of 1378740 is about 111.2997336866.

Subtracting from 1378740 its reverse (478731), we obtain a palindrome (900009).

The spelling of 1378740 in words is "one million, three hundred seventy-eight thousand, seven hundred forty".