1378489 has 4 divisors (see below), whose sum is σ = 1575424. Its totient is φ = 1181556.

The previous prime is 1378441. The next prime is 1378499. The reversal of 1378489 is 9848731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9848731 = 31 ⋅317701.

It is a cyclic number.

It is not a de Polignac number, because 1378489 - 2⁹ = 1377977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98457 + ... + 98470.

It is an arithmetic number, because the mean of its divisors is an integer number (393856).

2^1378489 is an apocalyptic number.

It is an amenable number.

1378489 is a deficient number, since it is larger than the sum of its proper divisors (196935).

1378489 is an equidigital number, since it uses as much as digits as its factorization.

1378489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196934.

The product of its digits is 48384, while the sum is 40.

The square root of 1378489 is about 1174.0907119980. The cubic root of 1378489 is about 111.2929792276.

The spelling of 1378489 in words is "one million, three hundred seventy-eight thousand, four hundred eighty-nine".