677909 has 4 divisors (see below), whose sum is σ = 717804. Its totient is φ = 638016.

The previous prime is 677891. The next prime is 677927. The reversal of 677909 is 909776.

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 (677891) and next prime (677927).

It can be written as a sum of positive squares in 2 ways, for example, as 305809 + 372100 = 553^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 677909 - 2¹⁶ = 612373 is a prime.

It is a super-2 number, since 2×677909² = 919121224562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677959) 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, 19922 + ... + 19955.

It is an arithmetic number, because the mean of its divisors is an integer number (179451).

2⁶⁷⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

677909 is a deficient number, since it is larger than the sum of its proper divisors (39895).

677909 is a wasteful number, since it uses less digits than its factorization.

677909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39894.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 677909 is about 823.3522939787. The cubic root of 677909 is about 87.8463658883.

The spelling of 677909 in words is "six hundred seventy-seven thousand, nine hundred nine".