739681 has 4 divisors (see below), whose sum is σ = 757764. Its totient is φ = 721600.

The previous prime is 739649. The next prime is 739693. The reversal of 739681 is 186937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186937 = 131 ⋅1427.

It can be written as a sum of positive squares in 2 ways, for example, as 32400 + 707281 = 180^2 + 841^2 .

It is not a de Polignac number, because 739681 - 2⁵ = 739649 is a prime.

It is a super-2 number, since 2×739681² = 1094255963522, which contains 22 as substring.

It is a Duffinian number.

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, 8980 + ... + 9061.

It is an arithmetic number, because the mean of its divisors is an integer number (189441).

2⁷³⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

739681 is a deficient number, since it is larger than the sum of its proper divisors (18083).

739681 is a wasteful number, since it uses less digits than its factorization.

739681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18082.

The product of its digits is 9072, while the sum is 34.

The square root of 739681 is about 860.0470917339. The cubic root of 739681 is about 90.4374179425.

It can be divided in two parts, 7396 and 81, that multiplied together give a square (599076 = 774²).

The spelling of 739681 in words is "seven hundred thirty-nine thousand, six hundred eighty-one".