1378969 has 2 divisors, whose sum is σ = 1378970. Its totient is φ = 1378968.

The previous prime is 1378961. The next prime is 1378997. The reversal of 1378969 is 9698731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 44944 = 1155^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378969 - 2³ = 1378961 is a prime.

It is a super-2 number, since 2×1378969² = 3803111005922, which contains 22 as substring.

1378969 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1378961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689484 + 689485.

It is an arithmetic number, because the mean of its divisors is an integer number (689485).

2^1378969 is an apocalyptic number.

It is an amenable number.

1378969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378969 is an equidigital number, since it uses as much as digits as its factorization.

1378969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 1378969 is about 1174.2951077136. The cubic root of 1378969 is about 111.3058954062.

Subtracting from 1378969 its product of digits (81648), we obtain a square (1297321 = 1139²).

The spelling of 1378969 in words is "one million, three hundred seventy-eight thousand, nine hundred sixty-nine".