3128722 has 4 divisors (see below), whose sum is σ = 4693086. Its totient is φ = 1564360.

The previous prime is 3128701. The next prime is 3128729. The reversal of 3128722 is 2278213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2278213 = 7 ⋅325459.

It can be written as a sum of positive squares in only one way, i.e., 2247001 + 881721 = 1499^2 + 939^2 .

It is not an unprimeable number, because it can be changed into a prime (3128729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782179 + ... + 782182.

Almost surely, 2^3128722 is an apocalyptic number.

3128722 is a deficient number, since it is larger than the sum of its proper divisors (1564364).

3128722 is a wasteful number, since it uses less digits than its factorization.

3128722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564363.

The product of its digits is 1344, while the sum is 25.

The square root of 3128722 is about 1768.8193802647. The cubic root of 3128722 is about 146.2589075832.

The spelling of 3128722 in words is "three million, one hundred twenty-eight thousand, seven hundred twenty-two".