739661 has 4 divisors (see below), whose sum is σ = 796572. Its totient is φ = 682752.

The previous prime is 739649. The next prime is 739693. The reversal of 739661 is 166937.

739661 = 156² + 157² + ... + 181².

739661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166937 = 97 ⋅1721.

It can be written as a sum of positive squares in 2 ways, for example, as 42436 + 697225 = 206^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 739661 - 2¹⁸ = 477517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 739661.

It is not an unprimeable number, because it can be changed into a prime (739601) 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, 28436 + ... + 28461.

It is an arithmetic number, because the mean of its divisors is an integer number (199143).

2⁷³⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

739661 is a deficient number, since it is larger than the sum of its proper divisors (56911).

739661 is a wasteful number, since it uses less digits than its factorization.

739661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56910.

The product of its digits is 6804, while the sum is 32.

The square root of 739661 is about 860.0354643850. The cubic root of 739661 is about 90.4366028323.

The spelling of 739661 in words is "seven hundred thirty-nine thousand, six hundred sixty-one".