1209897 has 24 divisors (see below), whose sum is σ = 1956864. Its totient is φ = 742608.

The previous prime is 1209889. The next prime is 1209931. The reversal of 1209897 is 7989021.

It is a happy number.

It is not a de Polignac number, because 1209897 - 2³ = 1209889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1209877) 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, 2968 + ... + 3350.

It is an arithmetic number, because the mean of its divisors is an integer number (81536).

2^1209897 is an apocalyptic number.

It is an amenable number.

1209897 is a deficient number, since it is larger than the sum of its proper divisors (746967).

1209897 is an equidigital number, since it uses as much as digits as its factorization.

1209897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1209897 is about 1099.9531808218. The cubic root of 1209897 is about 106.5571999812.

The spelling of 1209897 in words is "one million, two hundred nine thousand, eight hundred ninety-seven".