1389515 has 4 divisors (see below), whose sum is σ = 1667424. Its totient is φ = 1111608.

The previous prime is 1389511. The next prime is 1389533. The reversal of 1389515 is 5159831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5159831 = 137 ⋅37663.

It is a cyclic number.

It is not a de Polignac number, because 1389515 - 2² = 1389511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389511) 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, 138947 + ... + 138956.

It is an arithmetic number, because the mean of its divisors is an integer number (416856).

2^1389515 is an apocalyptic number.

1389515 is a deficient number, since it is larger than the sum of its proper divisors (277909).

1389515 is an equidigital number, since it uses as much as digits as its factorization.

1389515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277908.

The product of its digits is 5400, while the sum is 32.

The square root of 1389515 is about 1178.7769084946. The cubic root of 1389515 is about 111.5889214047.

The spelling of 1389515 in words is "one million, three hundred eighty-nine thousand, five hundred fifteen".