1909425 has 24 divisors (see below), whose sum is σ = 3608896. Its totient is φ = 872640.

The previous prime is 1909421. The next prime is 1909429. The reversal of 1909425 is 5249091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1909421) and next prime (1909429).

It is not a de Polignac number, because 1909425 - 2² = 1909421 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1909392 and 1909401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1294 + ... + 2343.

2^1909425 is an apocalyptic number.

1909425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1909425 is a deficient number, since it is larger than the sum of its proper divisors (1699471).

1909425 is a wasteful number, since it uses less digits than its factorization.

1909425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657 (or 3652 counting only the distinct ones).

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

The square root of 1909425 is about 1381.8194527506. The cubic root of 1909425 is about 124.0606926266.

The spelling of 1909425 in words is "one million, nine hundred nine thousand, four hundred twenty-five".