1385689 has 4 divisors (see below), whose sum is σ = 1458640. Its totient is φ = 1312740.

The previous prime is 1385647. The next prime is 1385693. The reversal of 1385689 is 9865831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9865831 = 17 ⋅580343.

It is a cyclic number.

It is not a de Polignac number, because 1385689 - 2⁷ = 1385561 is a prime.

It is a Duffinian number.

1385689 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1385609) 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, 36447 + ... + 36484.

It is an arithmetic number, because the mean of its divisors is an integer number (364660).

2^1385689 is an apocalyptic number.

1385689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1385689 is a deficient number, since it is larger than the sum of its proper divisors (72951).

1385689 is an equidigital number, since it uses as much as digits as its factorization.

1385689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72950.

The product of its digits is 51840, while the sum is 40.

The square root of 1385689 is about 1177.1529212469. The cubic root of 1385689 is about 111.4864080170.

The spelling of 1385689 in words is "one million, three hundred eighty-five thousand, six hundred eighty-nine".