1201789 has 6 divisors (see below), whose sum is σ = 1245530. Its totient is φ = 1159536.

The previous prime is 1201787. The next prime is 1201793. The reversal of 1201789 is 9871021.

It can be written as a sum of positive squares in 3 ways, for example, as 28900 + 1172889 = 170^2 + 1083^2 .

It is not a de Polignac number, because 1201789 - 2¹ = 1201787 is a prime.

It is a Duffinian number.

1201789 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127 + ... + 1555.

2^1201789 is an apocalyptic number.

It is an amenable number.

1201789 is a deficient number, since it is larger than the sum of its proper divisors (43741).

1201789 is an equidigital number, since it uses as much as digits as its factorization.

1201789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1201789 is about 1096.2613739433. The cubic root of 1201789 is about 106.3186389244.

The spelling of 1201789 in words is "one million, two hundred one thousand, seven hundred eighty-nine".