1625397 has 4 divisors (see below), whose sum is σ = 2167200. Its totient is φ = 1083596.

The previous prime is 1625383. The next prime is 1625417. The reversal of 1625397 is 7935261.

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: 7935261 = 3 ⋅2645087.

It is a cyclic number.

It is not a de Polignac number, because 1625397 - 2¹⁰ = 1624373 is a prime.

It is a super-3 number, since 3×1625397³ = 12882484133344337319, which contains 333 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625347) 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, 270897 + ... + 270902.

It is an arithmetic number, because the mean of its divisors is an integer number (541800).

2^1625397 is an apocalyptic number.

It is an amenable number.

1625397 is a deficient number, since it is larger than the sum of its proper divisors (541803).

1625397 is an equidigital number, since it uses as much as digits as its factorization.

1625397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541802.

The product of its digits is 11340, while the sum is 33.

The square root of 1625397 is about 1274.9105851000. The cubic root of 1625397 is about 117.5763077590.

The spelling of 1625397 in words is "one million, six hundred twenty-five thousand, three hundred ninety-seven".