734821 has 4 divisors (see below), whose sum is σ = 737100. Its totient is φ = 732544.

The previous prime is 734819. The next prime is 734837. The reversal of 734821 is 128437.

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 260100 + 474721 = 510^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 734821 - 2¹ = 734819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (734021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (184275).

734821 is a Friedman number, since it can be written as 3+7*(18^4-2), using all its digits and the basic arithmetic operations.

2⁷³⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

734821 is a deficient number, since it is larger than the sum of its proper divisors (2279).

734821 is a wasteful number, since it uses less digits than its factorization.

734821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278.

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

The square root of 734821 is about 857.2170086973. The cubic root of 734821 is about 90.2389125505.

The spelling of 734821 in words is "seven hundred thirty-four thousand, eight hundred twenty-one".