1389669225 has 24 divisors (see below), whose sum is σ = 2625814080. Its totient is φ = 635277120.

The previous prime is 1389669221. The next prime is 1389669263. The reversal of 1389669225 is 5229669831.

It is not a de Polignac number, because 1389669225 - 2² = 1389669221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1389669221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1322970 + ... + 1324019.

It is an arithmetic number, because the mean of its divisors is an integer number (109408920).

Almost surely, 2^1389669225 is an apocalyptic number.

1389669225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389669225 is a deficient number, since it is larger than the sum of its proper divisors (1236144855).

1389669225 is a wasteful number, since it uses less digits than its factorization.

1389669225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647009 (or 2647004 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 1389669225 is about 37278.2674624237. The cubic root of 1389669225 is about 1115.9304974316.

The spelling of 1389669225 in words is "one billion, three hundred eighty-nine million, six hundred sixty-nine thousand, two hundred twenty-five".