1925409 has 4 divisors (see below), whose sum is σ = 2567216. Its totient is φ = 1283604.

The previous prime is 1925393. The next prime is 1925431. The reversal of 1925409 is 9045291.

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.

It is not a de Polignac number, because 1925409 - 2⁴ = 1925393 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1925459) 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, 320899 + ... + 320904.

It is an arithmetic number, because the mean of its divisors is an integer number (641804).

2^1925409 is an apocalyptic number.

It is an amenable number.

1925409 is a deficient number, since it is larger than the sum of its proper divisors (641807).

1925409 is an equidigital number, since it uses as much as digits as its factorization.

1925409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641806.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1925409 is about 1387.5910780918. The cubic root of 1925409 is about 124.4059062273.

The spelling of 1925409 in words is "one million, nine hundred twenty-five thousand, four hundred nine".