1378889 has 4 divisors (see below), whose sum is σ = 1402320. Its totient is φ = 1355460.

The previous prime is 1378859. The next prime is 1378903. The reversal of 1378889 is 9888731.

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.

It is a cyclic number.

It is not a de Polignac number, because 1378889 - 2²⁰ = 330313 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1378859) 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, 11627 + ... + 11744.

It is an arithmetic number, because the mean of its divisors is an integer number (350580).

2^1378889 is an apocalyptic number.

It is an amenable number.

1378889 is a deficient number, since it is larger than the sum of its proper divisors (23431).

1378889 is an equidigital number, since it uses as much as digits as its factorization.

1378889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23430.

The product of its digits is 96768, while the sum is 44.

The square root of 1378889 is about 1174.2610442316. The cubic root of 1378889 is about 111.3037429180.

The spelling of 1378889 in words is "one million, three hundred seventy-eight thousand, eight hundred eighty-nine".