123003649 has 4 divisors (see below), whose sum is σ = 126003780. Its totient is φ = 120003520.

The previous prime is 123003641. The next prime is 123003659. The reversal of 123003649 is 946300321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14010049 + 108993600 = 3743^2 + 10440^2 .

It is a cyclic number.

It is not a de Polignac number, because 123003649 - 2³ = 123003641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123003641) 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, 1500004 + ... + 1500085.

It is an arithmetic number, because the mean of its divisors is an integer number (31500945).

Almost surely, 2^123003649 is an apocalyptic number.

It is an amenable number.

123003649 is a deficient number, since it is larger than the sum of its proper divisors (3000131).

123003649 is an equidigital number, since it uses as much as digits as its factorization.

123003649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000130.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 123003649 is about 11090.7010148142. The cubic root of 123003649 is about 497.3239012104.

The spelling of 123003649 in words is "one hundred twenty-three million, three thousand, six hundred forty-nine".