1625945 has 4 divisors (see below), whose sum is σ = 1951140. Its totient is φ = 1300752.

The previous prime is 1625933. The next prime is 1625951. The reversal of 1625945 is 5495261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5495261 = 191 ⋅28771.

It can be written as a sum of positive squares in 2 ways, for example, as 1261129 + 364816 = 1123^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625945 - 2¹² = 1621849 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162590 + ... + 162599.

It is an arithmetic number, because the mean of its divisors is an integer number (487785).

2^1625945 is an apocalyptic number.

It is an amenable number.

1625945 is a deficient number, since it is larger than the sum of its proper divisors (325195).

1625945 is an equidigital number, since it uses as much as digits as its factorization.

1625945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325194.

The product of its digits is 10800, while the sum is 32.

The square root of 1625945 is about 1275.1254840211. The cubic root of 1625945 is about 117.5895198290.

The spelling of 1625945 in words is "one million, six hundred twenty-five thousand, nine hundred forty-five".