1625389 has 4 divisors (see below), whose sum is σ = 1645056. Its totient is φ = 1605724.

The previous prime is 1625383. The next prime is 1625417. The reversal of 1625389 is 9835261.

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.

It is a cyclic number.

It is not a de Polignac number, because 1625389 - 2¹⁵ = 1592621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9709 + ... + 9874.

It is an arithmetic number, because the mean of its divisors is an integer number (411264).

2^1625389 is an apocalyptic number.

It is an amenable number.

1625389 is a deficient number, since it is larger than the sum of its proper divisors (19667).

1625389 is an equidigital number, since it uses as much as digits as its factorization.

1625389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19666.

The product of its digits is 12960, while the sum is 34.

The square root of 1625389 is about 1274.9074476212. The cubic root of 1625389 is about 117.5761148601.

The spelling of 1625389 in words is "one million, six hundred twenty-five thousand, three hundred eighty-nine".