656739 has 12 divisors (see below), whose sum is σ = 971256. Its totient is φ = 427392.

The previous prime is 656737. The next prime is 656741. The reversal of 656739 is 937656.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (656737) and next prime (656741).

It is not a de Polignac number, because 656739 - 2¹ = 656737 is a prime.

It is a super-2 number, since 2×656739² = 862612228242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (656737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 462 + ... + 1235.

It is an arithmetic number, because the mean of its divisors is an integer number (80938).

2⁶⁵⁶⁷³⁹ is an apocalyptic number.

656739 is a deficient number, since it is larger than the sum of its proper divisors (314517).

656739 is a wasteful number, since it uses less digits than its factorization.

656739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746 (or 1743 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 656739 is about 810.3943484502. The cubic root of 656739 is about 86.9222452334.

The spelling of 656739 in words is "six hundred fifty-six thousand, seven hundred thirty-nine".