661434 has 16 divisors (see below), whose sum is σ = 1380672. Its totient is φ = 210848.

The previous prime is 661421. The next prime is 661439. The reversal of 661434 is 434166.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661434.

It is not an unprimeable number, because it can be changed into a prime (661439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2259 + ... + 2534.

It is an arithmetic number, because the mean of its divisors is an integer number (86292).

2⁶⁶¹⁴³⁴ is an apocalyptic number.

661434 is an abundant number, since it is smaller than the sum of its proper divisors (719238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661434 is a wasteful number, since it uses less digits than its factorization.

661434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4821.

The product of its digits is 1728, while the sum is 24.

The square root of 661434 is about 813.2859275802. The cubic root of 661434 is about 87.1288881001.

The spelling of 661434 in words is "six hundred sixty-one thousand, four hundred thirty-four".