1203649 has 4 divisors (see below), whose sum is σ = 1207764. Its totient is φ = 1199536.

The previous prime is 1203641. The next prime is 1203661. The reversal of 1203649 is 9463021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9463021 = 293 ⋅32297.

It can be written as a sum of positive squares in 2 ways, for example, as 37249 + 1166400 = 193^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1203649 - 2³ = 1203641 is a prime.

It is a Duffinian number.

1203649 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203641) 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, 1582 + ... + 2215.

It is an arithmetic number, because the mean of its divisors is an integer number (301941).

2^1203649 is an apocalyptic number.

It is an amenable number.

1203649 is a deficient number, since it is larger than the sum of its proper divisors (4115).

1203649 is an equidigital number, since it uses as much as digits as its factorization.

1203649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1203649 is about 1097.1093837900. The cubic root of 1203649 is about 106.3734601773.

The spelling of 1203649 in words is "one million, two hundred three thousand, six hundred forty-nine".