661934 has 16 divisors (see below), whose sum is σ = 1222368. Its totient is φ = 261792.

The previous prime is 661931. The next prime is 661939. The reversal of 661934 is 439166.

661934 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661897 and 661906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1637 + ... + 2000.

It is an arithmetic number, because the mean of its divisors is an integer number (76398).

2⁶⁶¹⁹³⁴ is an apocalyptic number.

661934 is a deficient number, since it is larger than the sum of its proper divisors (560434).

661934 is a wasteful number, since it uses less digits than its factorization.

661934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659.

The product of its digits is 3888, while the sum is 29.

The square root of 661934 is about 813.5932644756. The cubic root of 661934 is about 87.1508371136.

The spelling of 661934 in words is "six hundred sixty-one thousand, nine hundred thirty-four".