1200891 has 4 divisors (see below), whose sum is σ = 1601192. Its totient is φ = 800592.

The previous prime is 1200889. The next prime is 1200917. The reversal of 1200891 is 1980021.

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

It is not a de Polignac number, because 1200891 - 2¹ = 1200889 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1200811) 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, 200146 + ... + 200151.

It is an arithmetic number, because the mean of its divisors is an integer number (400298).

2^1200891 is an apocalyptic number.

1200891 is a deficient number, since it is larger than the sum of its proper divisors (400301).

1200891 is an equidigital number, since it uses as much as digits as its factorization.

1200891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400300.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1200891 is about 1095.8517235466. The cubic root of 1200891 is about 106.2921512111.

The spelling of 1200891 in words is "one million, two hundred thousand, eight hundred ninety-one".