1909497 has 4 divisors (see below), whose sum is σ = 2546000. Its totient is φ = 1272996.

The previous prime is 1909489. The next prime is 1909513. The reversal of 1909497 is 7949091.

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 1909497 - 2³ = 1909489 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 (1909477) 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, 318247 + ... + 318252.

It is an arithmetic number, because the mean of its divisors is an integer number (636500).

2^1909497 is an apocalyptic number.

It is an amenable number.

1909497 is a deficient number, since it is larger than the sum of its proper divisors (636503).

1909497 is an equidigital number, since it uses as much as digits as its factorization.

1909497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636502.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 1909497 is about 1381.8455051126. The cubic root of 1909497 is about 124.0622519542.

It can be divided in two parts, 19094 and 97, that added together give a palindrome (19191).

The spelling of 1909497 in words is "one million, nine hundred nine thousand, four hundred ninety-seven".