1439969 has 2 divisors, whose sum is σ = 1439970. Its totient is φ = 1439968.

The previous prime is 1439947. The next prime is 1439989. The reversal of 1439969 is 9699341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 620944 = 905^2 + 788^2 .

It is an emirp because it is prime and its reverse (9699341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1439969 - 2²⁰ = 391393 is a prime.

It is a super-2 number, since 2×1439969² = 4147021441922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1439909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719984 + 719985.

It is an arithmetic number, because the mean of its divisors is an integer number (719985).

2^1439969 is an apocalyptic number.

It is an amenable number.

1439969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439969 is an equidigital number, since it uses as much as digits as its factorization.

1439969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 1439969 is about 1199.9870832638. The cubic root of 1439969 is about 112.9235131233.

The spelling of 1439969 in words is "one million, four hundred thirty-nine thousand, nine hundred sixty-nine".