2028731 has 4 divisors (see below), whose sum is σ = 2037672. Its totient is φ = 2019792.

The previous prime is 2028713. The next prime is 2028749. The reversal of 2028731 is 1378202.

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

It is an interprime number because it is at equal distance from previous prime (2028713) and next prime (2028749).

It is a cyclic number.

It is not a de Polignac number, because 2028731 - 2⁶ = 2028667 is a prime.

It is a super-2 number, since 2×2028731² = 8231498940722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2028697 and 2028706.

It is not an unprimeable number, because it can be changed into a prime (2028701) 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, 4121 + ... + 4586.

It is an arithmetic number, because the mean of its divisors is an integer number (509418).

2^2028731 is an apocalyptic number.

2028731 is a deficient number, since it is larger than the sum of its proper divisors (8941).

2028731 is an equidigital number, since it uses as much as digits as its factorization.

2028731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8940.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2028731 is about 1424.3352835621. The cubic root of 2028731 is about 126.5925520568.

The spelling of 2028731 in words is "two million, twenty-eight thousand, seven hundred thirty-one".