3123649 has 4 divisors (see below), whose sum is σ = 3196336. Its totient is φ = 3050964.

The previous prime is 3123643. The next prime is 3123671. The reversal of 3123649 is 9463213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3123649 - 2³ = 3123641 is a prime.

It is a Duffinian number.

3123649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3123641) 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, 36279 + ... + 36364.

It is an arithmetic number, because the mean of its divisors is an integer number (799084).

Almost surely, 2^3123649 is an apocalyptic number.

It is an amenable number.

3123649 is a deficient number, since it is larger than the sum of its proper divisors (72687).

3123649 is an equidigital number, since it uses as much as digits as its factorization.

3123649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72686.

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

The square root of 3123649 is about 1767.3847911533. The cubic root of 3123649 is about 146.1798153513.

The spelling of 3123649 in words is "three million, one hundred twenty-three thousand, six hundred forty-nine".