1909097 has 4 divisors (see below), whose sum is σ = 1913940. Its totient is φ = 1904256.

The previous prime is 1909091. The next prime is 1909109. The reversal of 1909097 is 7909091.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 177241 + 1731856 = 421^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909097 - 2⁴ = 1909081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909091) 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, 1772 + ... + 2637.

It is an arithmetic number, because the mean of its divisors is an integer number (478485).

2^1909097 is an apocalyptic number.

It is an amenable number.

1909097 is a deficient number, since it is larger than the sum of its proper divisors (4843).

1909097 is an equidigital number, since it uses as much as digits as its factorization.

1909097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4842.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 1909097 is about 1381.7007635519. The cubic root of 1909097 is about 124.0535885268.

The spelling of 1909097 in words is "one million, nine hundred nine thousand, ninety-seven".