3121723 has 4 divisors (see below), whose sum is σ = 3405528. Its totient is φ = 2837920.

The previous prime is 3121717. The next prime is 3121739. The reversal of 3121723 is 3271213.

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

It is a cyclic number.

It is not a de Polignac number, because 3121723 - 2⁵ = 3121691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121723.

It is not an unprimeable number, because it can be changed into a prime (3121423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141886 + ... + 141907.

It is an arithmetic number, because the mean of its divisors is an integer number (851382).

Almost surely, 2^3121723 is an apocalyptic number.

3121723 is a deficient number, since it is larger than the sum of its proper divisors (283805).

3121723 is a wasteful number, since it uses less digits than its factorization.

3121723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283804.

The product of its digits is 252, while the sum is 19.

The square root of 3121723 is about 1766.8398342804. The cubic root of 3121723 is about 146.1497650043.

Adding to 3121723 its reverse (3271213), we get a palindrome (6392936).

It can be divided in two parts, 3121 and 723, that added together give a square (3844 = 62²).

The spelling of 3121723 in words is "three million, one hundred twenty-one thousand, seven hundred twenty-three".