1378989 has 12 divisors (see below), whose sum is σ = 2109276. Its totient is φ = 865152.

The previous prime is 1378969. The next prime is 1378997. The reversal of 1378989 is 9898731.

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 514089 = 930^2 + 717^2 .

It is not a de Polignac number, because 1378989 - 2⁵ = 1378957 is a prime.

It is a super-2 number, since 2×1378989² = 3803221324242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4354 + ... + 4659.

It is an arithmetic number, because the mean of its divisors is an integer number (175773).

2^1378989 is an apocalyptic number.

It is an amenable number.

1378989 is a deficient number, since it is larger than the sum of its proper divisors (730287).

1378989 is a wasteful number, since it uses less digits than its factorization.

1378989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036 (or 9033 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1378989 is about 1174.3036234296. The cubic root of 1378989 is about 111.3064335153.

It can be divided in two parts, 13789 and 89, that multiplied together give a palindrome (1227221).

The spelling of 1378989 in words is "one million, three hundred seventy-eight thousand, nine hundred eighty-nine".