1955409 has 4 divisors (see below), whose sum is σ = 2607216. Its totient is φ = 1303604.

The previous prime is 1955407. The next prime is 1955417. The reversal of 1955409 is 9045591.

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: 9045591 = 3 ⋅3015197.

It is a cyclic number.

It is not a de Polignac number, because 1955409 - 2¹ = 1955407 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1955409.

It is not an unprimeable number, because it can be changed into a prime (1955407) 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, 325899 + ... + 325904.

It is an arithmetic number, because the mean of its divisors is an integer number (651804).

2^1955409 is an apocalyptic number.

It is an amenable number.

1955409 is a deficient number, since it is larger than the sum of its proper divisors (651807).

1955409 is an equidigital number, since it uses as much as digits as its factorization.

1955409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651806.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 1955409 is about 1398.3593958636. The cubic root of 1955409 is about 125.0487063524.

The spelling of 1955409 in words is "one million, nine hundred fifty-five thousand, four hundred nine".